Terminal device, base station device, integrated circuit and communication method

ABSTRACT

There is provided a terminal device that communicates with a base station device. The terminal device includes a reception unit that receives downlink control information which is used for scheduling of a physical uplink shared channel and includes first information used to trigger a report of channel state information using the physical uplink shared channel, a higher layer signal including second information used to indicate two subframe sets, and the higher layer signal including third information. The third information is used to indicate a subframe set of the two subframe sets for which the report of the channel state information is triggered in a case that the report of the channel state information is triggered by a first value of a field of the first information, the third information is used to indicate a subframe set of the two subframe sets for which the report of the channel state information is triggered in a case that the report of the channel state information is triggered by a second value in the field of the first information, and the third information is used to indicate a subframe set of the two subframe sets for which the report of the channel state information is triggered in a case that the report of the channel state information is triggered by a third value in the field of the first information.

TECHNICAL FIELD

The present invention relates to a terminal device, a base stationdevice, an integrated circuit and a communication method.

The present application claims priority to Japanese Patent ApplicationNo. 2013-141554 filed in the Japanese Patent Office on Jul. 5, 2013, thedisclosure of which is herein incorporated by reference in its entirety.

BACKGROUND ART

A cellular mobile communication wireless access system and a wirelessnetwork (hereinafter, referred to as “Long Term Evolution (LTE)” or“Evolved Universal Terrestrial Radio Access (EUTRA)”) have been examinedin the 3rd Generation Partnership Project (3GPP). In the LTE system, abase station device is also referred to as evolved NodeB (eNodeB) and aterminal device is also referred to as user equipment (UE). The LTEsystem is a cellular communication system in which a plurality ofcoverage areas of the base station device are arranged in a cell shape.A single base station device may manage a plurality of cells.

The LTE system corresponds to a time division duplex (TDD) system. TheLTE system using the TDD system is also referred to as a TD-LTE systemor an LTE TDD system. The TDD system is a technique that performs timedivision multiplexing on an uplink signal and a downlink signal in orderto perform full duplex communication in a single frequency band.

In the 3GPP, application of interference management and trafficadaptation (IMTA) to the TD-LTE system has been examined. Trafficadaptation is a technique that changes the ratio of uplink resources todownlink resources depending on uplink traffic and downlink traffic.

NPL 1 discloses a method of using a flexible subframe as a method forachieving traffic adaptation. The base station device can receive uplinksignals or transmit downlink signals in the flexible subframe. In NPL 1,the terminal device regards the flexible subframe as a downlink subframeas long as the base station device does not instruct the terminal deviceto transmit the uplink signals in the flexible subframe. The trafficadaptation technique is also referred to as dynamic TDD.

NPL 1 discloses a technique that determines hybrid automatic repeatrequest (HARQ) timing for a physical downlink shared channel (PDSCH) onthe basis of the uplink-downlink configuration to be newly introducedand determines the HARQ timing for a physical uplink shared channel(PUSCH) on the basis of the initial UL-DL configuration.

NPL 2 discloses the following techniques: (a) a UL/DL referenceconfiguration which is introduced; and (b) some subframes which arescheduled for uplink or downlink by a dynamic grant/assignment from ascheduler.

A procedure of the terminal device for reporting channel stateinformation (CSI) is described in section 7.2 of NPL 3. The base stationdevice allocates downlink resources to the terminal device on the basisof the channel state information reported from a plurality of terminaldevices. The channel state information includes a channel qualityindicator (CQI).

CITATION LIST Non-Patent Literature

NPL 1:“On standardization impact of TDD UL-DL adaptation”, R1-122016,Ericsson, ST-Ericsson, 3GPP TSG-RAN WG1 Meeting #69, Prague, CzechRepublic, 21st-25th May 2012.

NPL 2:“Signaling support for dynamic TDD”, R1-130558, Ericsson,ST-Ericsson, 3GPP TSG-RAN WG1 Meeting #72, St Julian's, Malta, 28thJan.-1st Feb. 2013.

NPL 3:“3GPP TS36.213 v11.2.0 (2013-02)”, February, 2013.

SUMMARY OF INVENTION Technical Problem

However, a technique related to the channel state information has notbeen examined in the wireless communication system.

The invention has been made in view of the foregoing circumstances, andit is an object of the invention to provide a terminal device, a basestation device, an integrated circuit and a wireless communicationmethod that can efficiently perform communication in a wirelesscommunication system that uses channel state information.

Solution to Problem

(1) In order to achieve the aforementioned object, the present inventionprovides the following means. A terminal device according to a firstaspect of the present invention is a terminal device that communicateswith a base station device. The terminal device includes a receptionunit that receives downlink control information which is used forscheduling of a physical uplink shared channel and includes firstinformation used to trigger a report of channel state information usingthe physical uplink shared channel, a higher layer signal includingsecond information used to indicate two subframe sets, and the higherlayer signal including third information. The third information is usedto indicate a subframe set of the two subframe sets for which the reportof the channel state information is triggered in a case that the reportof the channel state information is triggered by a first value in afield of the first information, the third information is used toindicate a subframe set of the two subframe sets for which the report ofthe channel state information is triggered in a case that the report ofthe channel state information is triggered by a second value in thefield of the first information, and the third information is used toindicate a subframe set of the two subframe sets for which the report ofthe channel state information is triggered in a case that the report ofthe channel state information is triggered by a third value in the fieldof the first information.

(2) A terminal device according to a second aspect of the presentinvention further includes a reception unit that receives the higherlayer signal including fourth information. The fourth information isused to indicate a CSI process, which corresponds to the subframe setindicated using the third information and in which the report istriggered by the first value in the field of the first information, forone CSI process or each of a plurality of CSI processes, the fourthinformation is used to indicate a CSI process, which corresponds to thesubframe set indicated using the third information and in which thereport is triggered by the second value in the field of the firstinformation, and the fourth information is used to indicate a CSIprocess, which corresponds to the subframe set indicated using the thirdinformation and in which the report is triggered by the third value inthe field of the first information.

(3) A terminal device according to a third aspect of the presentinvention further includes a transmission unit that reports the channelstate information for a pair of one CSI process or each of a pluralityof CSI processes and the subframe set indicated using the thirdinformation by using the physical uplink shared channel in a case thatthe report of the channel state information is triggered by the firstvalue in the field of the first information, reports the channel stateinformation for a pair of one CSI process or each of a plurality of CSIprocesses and the subframe set indicated using the third information byusing the physical uplink shared channel in a case that the report ofthe channel state information is triggered by the second value in thefield of the first information, and reports the channel stateinformation for a pair of one CSI process or each of a plurality of CSIprocesses and the subframe set indicated using the third information byusing the physical uplink shared channel in a case that the report ofthe channel state information is triggered by the third value in thefield of the first information.

(4) A terminal device according to a fourth aspect of the presentinvention further includes a transmission unit that reports the channelstate information for a pair of the one CSI process or each of theplurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thefirst value in the field of the first information, reports the channelstate information for a pair of the one CSI process or each of theplurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thesecond value in the field of the first information, and reports thechannel state information for a pair of the one CSI process or each ofthe plurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thethird value in the field of the first information.

(5) A base station device according to a fifth aspect of the presentinvention is a base station device that communicates with a terminaldevice. The base station device includes a transmission unit thattransmits downlink control information which is used for scheduling of aphysical uplink shared channel and includes first information used totrigger a report of channel state information using the physical uplinkshared channel, a higher layer signal including second information usedto indicate two subframe sets, and the higher layer signal includingthird information. The third information is used to indicate a subframeset of the two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a first value of a field of the firstinformation, the third information is used to indicate a subframe set ofthe two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a second value in the field of the firstinformation, and the third information is used to indicate a subframeset of the two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a third value in the field of the firstinformation.

(6) A base station device according to a sixth aspect of the presentinvention further includes a transmission unit that transmits the higherlayer signal including fourth information. The fourth information isused to indicate a CSI process, which corresponds to the subframe setindicated using the third information and in which the report istriggered by the first value in the field of the first information, forone CSI process or each of a plurality of CSI processes, the fourthinformation is used to indicate a CSI process, which corresponds to thesubframe set indicated using the third information and in which thereport is triggered by the second value in the field of the firstinformation, and the fourth information is used to indicate a CSIprocess, which corresponds to the subframe set indicated using the thirdinformation and in which the report is triggered by the third value inthe field of the first information.

(7) In a base station device according to a seventh aspect of thepresent invention, the report of the channel state information for apair of one CSI process or each of a plurality of CSI processes and thesubframe set indicated using the third information by using the physicaluplink shared channel is triggered by the first value in the field ofthe first information, the report of the channel state information for apair of one CSI process or each of a plurality of CSI processes and thesubframe set indicated using the third information by using the physicaluplink shared channel is triggered by the second value in the field ofthe first information, and the report of the channel state informationfor a pair of one CSI process or each of a plurality of CSI processesand the subframe set indicated using the third information by using thephysical uplink shared channel is triggered by the third value in thefield of the first information.

(8) In a base station device according to an eighth aspect of thepresent invention, the report of the channel state information for apair of the one CSI process or each of the plurality of CSI processesand the subframe set indicated using the third information by using thephysical uplink shared channel is triggered by the first value in thefield of the first information, the report of the channel stateinformation for a pair of the one CSI process or each of the pluralityof CSI processes and the subframe set indicated using the thirdinformation by using the physical uplink shared channel is triggered bythe second value in the field of the first information, and the reportof the channel state information for a pair of the one CSI process oreach of the plurality of CSI processes and the subframe set indicatedusing the third information by using the physical uplink shared channelis triggered by the third value in the field of the first information.

(9) An integrated circuit according to a ninth aspect of the presentinvention causes the terminal device to exhibit a function of receivingdownlink control information which is used for scheduling of a physicaluplink shared channel and includes first information used to trigger areport of channel state information using the physical uplink sharedchannel, a higher layer signal including second information used toindicate two subframe sets, and the higher layer signal including thirdinformation. The third information is used to indicate a subframe set ofthe two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a first value of a field of the firstinformation, the third information is used to indicate a subframe set ofthe two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a second value in the field of the firstinformation, and the third information is used to indicate a subframeset of the two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a third value in the field of the firstinformation.

(10) An integrated circuit according to a tenth aspect of the presentinvention causes the terminal device to exhibit a function of receivingthe higher layer signal including fourth information. The fourthinformation is used to indicate a CSI process, which corresponds to thesubframe set indicated using the third information and in which thereport is triggered by the first value in the field of the firstinformation, for one CSI process or each of a plurality of CSIprocesses, the fourth information is used to indicate a CSI process,which corresponds to the subframe set indicated using the thirdinformation and in which the report is triggered by the second value inthe field of the first information, and the fourth information is usedto indicate a CSI process, which corresponds to the subframe setindicated using the third information and in which the report istriggered by the third value in the field of the first information.

(11) An integrated circuit according to an eleventh aspect of thepresent invention causes the terminal device to exhibit a function ofreporting the channel state information for a pair of one CSI process oreach of a plurality of CSI processes and the subframe set indicatedusing the third information by using the physical uplink shared channelin a case that the report of the channel state information is triggeredby the first value in the field of the first information, reporting thechannel state information for a pair of one CSI process or each of aplurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thesecond value in the field of the first information, and reporting thechannel state information for a pair of one CSI process or each of aplurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thethird value in the field of the first information.

(12) An integrated circuit according to a twelfth aspect of the presentinvention causes the terminal device to exhibit a function of reportingthe channel state information for a pair of the one CSI process or eachof the plurality of CSI processes and the subframe set indicated usingthe third information by using the physical uplink shared channel in acase that the report of the channel state information is triggered bythe first value in the field of the first information, reporting thechannel state information for a pair of one CSI process or each of aplurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thesecond value in the field of the first information, and reporting thechannel state information for a pair of one CSI process or each of aplurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thethird value in the field of the first information.

(13) An integrated circuit according to a thirteenth aspect of thepresent invention is an integrated circuit that is mounted in a basestation communicating with a terminal device. The integrated circuitcauses the base station device to exhibit a function of transmittingdownlink control information which is used for scheduling of a physicaluplink shared channel and includes first information used to trigger areport of channel state information using the physical uplink sharedchannel, a higher layer signal including second information used toindicate two subframe sets, and the higher layer signal including thirdinformation. The third information is used to indicate a subframe set ofthe two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a first value of a field of the firstinformation, the third information is used to indicate a subframe set ofthe two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a second value in the field of the firstinformation, and the third information is used to indicate a subframeset of the two subframe sets for which the report of the channel stateinformation is triggered in a case that the report of the channel stateinformation is triggered by a third value in the field of the firstinformation.

(14) An integrated circuit according to a fourteenth aspect of thepresent invention causes the base station device to exhibit a functionof transmitting the higher layer signal including fourth information.The fourth information is used to indicate a CSI process, whichcorresponds to the subframe set indicated using the third informationand in which the report is triggered by the first value in the field ofthe first information, for one CSI process or each of a plurality of CSIprocesses, the fourth information is used to indicate a CSI process,which corresponds to the subframe set indicated using the thirdinformation and in which the report is triggered by the second value inthe field of the first information, and the fourth information is usedto indicate a CSI process, which corresponds to the subframe setindicated using the third information and in which the report istriggered by the third value in the field of the first information.

(15) In an integrated circuit according to a fifteenth aspect of thepresent invention, the report of the channel state information for apair of one CSI process or each of a plurality of CSI processes and thesubframe set indicated using the third information by using the physicaluplink shared channel is triggered by the first value in the field ofthe first information, the report of the channel state information for apair of one CSI process or each of a plurality of CSI processes and thesubframe set indicated using the third information by using the physicaluplink shared channel is triggered by the second value in the field ofthe first information, and the report of the channel state informationfor a pair of one CSI process or each of a plurality of CSI processesand the subframe set indicated using the third information by using thephysical uplink shared channel is triggered by the third value in thefield of the first information.

(16) In an integrated circuit according to a sixteenth aspect of thepresent invention, the report of the channel state information for apair of the one CSI process or each of the plurality of CSI processesand the subframe set indicated using the third information by using thephysical uplink shared channel is triggered by the first value in thefield of the first information, the report of the channel stateinformation for a pair of the one CSI process or each of the pluralityof CSI processes and the subframe set indicated using the thirdinformation by using the physical uplink shared channel is triggered bythe second value in the field of the first information, and the reportof the channel state information for a pair of the one CSI process oreach of the plurality of CSI processes and the subframe set indicatedusing the third information by using the physical uplink shared channelis triggered by the third value in the field of the first information.

(17) A communication method according to a seventeenth aspect of thepresent invention is a communication method used in a terminal devicecommunicating with a base station device. The method includes causingreceiving means to receive downlink control information which is usedfor scheduling of a physical uplink shared channel and includes firstinformation used to trigger a report of channel state information usingthe physical uplink shared channel, a higher layer signal includingsecond information used to indicate two subframe sets, and the higherlayer signal including third information. The third information is usedto indicate a subframe set of the two subframe sets for which the reportof the channel state information is triggered in a case that the reportof the channel state information is triggered by a first value of afield of the first information, the third information is used toindicate a subframe set of the two subframe sets for which the report ofthe channel state information is triggered in a case that the report ofthe channel state information is triggered by a second value in thefield of the first information, and the third information is used toindicate a subframe set of the two subframe sets for which the report ofthe channel state information is triggered in a case that the report ofthe channel state information is triggered by a third value in the fieldof the first information.

(18) A communication method according to an eighteenth aspect of thepresent invention further includes causing receiving means to receivethe higher layer signal including fourth information. The fourthinformation is used to indicate a CSI process, which corresponds to thesubframe set indicated using the third information and in which thereport is triggered by the first value in the field of the firstinformation, for one CSI process or each of a plurality of CSIprocesses, the fourth information is used to indicate a CSI process,which corresponds to the subframe set indicated using the thirdinformation and in which the report is triggered by the second value inthe field of the first information, and the fourth information is usedto indicate a CSI process, which corresponds to the subframe setindicated using the third information and in which the report istriggered by the third value in the field of the first information.

(19) A communication method according to a nineteenth aspect of thepresent invention further includes causing transmitting means to reportthe channel state information for a pair of one CSI process or each of aplurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thefirst value in the field of the first information, report the channelstate information for a pair of one CSI process or each of a pluralityof CSI processes and the subframe set indicated using the thirdinformation by using the physical uplink shared channel in a case thatthe report of the channel state information is triggered by the secondvalue in the field of the first information, and report the channelstate information for a pair of one CSI process or each of a pluralityof CSI processes and the subframe set indicated using the thirdinformation by using the physical uplink shared channel in a case thatthe report of the channel state information is triggered by the thirdvalue in the field of the first information.

(20) A communication method according to a twentieth aspect of thepresent invention further includes causing transmitting means to reportthe channel state information for a pair of the one CSI process or eachof the plurality of CSI processes and the subframe set indicated usingthe third information by using the physical uplink shared channel in acase that the report of the channel state information is triggered bythe first value in the field of the first information, report thechannel state information for a pair of the one CSI process or each ofthe plurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thesecond value in the field of the first information, and report thechannel state information for a pair of the one CSI process or each ofthe plurality of CSI processes and the subframe set indicated using thethird information by using the physical uplink shared channel in a casethat the report of the channel state information is triggered by thethird value in the field of the first information.

(21) A communication method according to a twenty first aspect of thepresent invention is a communication method used in a base stationdevice communicating with a terminal device. The method includes causingtransmitting means to transmit downlink control information which isused for scheduling of a physical uplink shared channel and includesfirst information used to trigger a report of channel state informationusing the physical uplink shared channel, a higher layer signalincluding second information used to indicate two subframe sets, and thehigher layer signal including third information. The third informationis used to indicate a subframe set of the two subframe sets for whichthe report of the channel state information is triggered in a case thatthe report of the channel state information is triggered by a firstvalue of a field of the first information, the third information is usedto indicate a subframe set of the two subframe sets for which the reportof the channel state information is triggered in a case that the reportof the channel state information is triggered by a second value in thefield of the first information, and the third information is used toindicate a subframe set of the two subframe sets for which the report ofthe channel state information is triggered in a case that the report ofthe channel state information is triggered by a third value in the fieldof the first information.

(22) A communication method according to a twenty second aspect of thepresent invention further includes causing transmitting means totransmit the higher layer signal including fourth information. Thefourth information is used to indicate a CSI process, which correspondsto the subframe set indicated using the third information and in whichthe report is triggered by the first value in the field of the firstinformation, for one CSI process or each of a plurality of CSIprocesses, the fourth information is used to indicate a CSI process,which corresponds to the subframe set indicated using the thirdinformation and in which the report is triggered by the second value inthe field of the first information, and the fourth information is usedto indicate a CSI process, which corresponds to the subframe setindicated using the third information and in which the report istriggered by the third value in the field of the first information.

(23) In a communication method according to a twenty third aspect of thepresent invention, the report of the channel state information for apair of one CSI process or each of a plurality of CSI processes and thesubframe set indicated using the third information by using the physicaluplink shared channel is triggered by the first value in the field ofthe first information, the report of the channel state information for apair of one CSI process or each of a plurality of CSI processes and thesubframe set indicated using the third information by using the physicaluplink shared channel is triggered by the second value in the field ofthe first information, and the report of the channel state informationfor a pair of one CSI process or each of a plurality of CSI processesand the subframe set indicated using the third information by using thephysical uplink shared channel is triggered by the third value in thefield of the first information.

(24) In a communication method according to a twenty fourth aspect ofthe present invention, the report of the channel state information for apair of the one CSI process or each of the plurality of CSI processesand the subframe set indicated using the third information by using thephysical uplink shared channel is triggered by the first value in thefield of the first information, the report of the channel stateinformation for a pair of the one CSI process or each of the pluralityof CSI processes and the subframe set indicated using the thirdinformation by using the physical uplink shared channel is triggered bythe second value in the field of the first information, and the reportof the channel state information for a pair of the one CSI process oreach of the plurality of CSI processes and the subframe set indicatedusing the third information by using the physical uplink shared channelis triggered by the third value in the field of the first information.

Advantageous Effects of Invention

According to an aspect of the present invention, it is possible to allowa terminal device and a base station device to efficiently performcommunication in a wireless communication system that uses channel stateinformation.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a conceptual diagram illustrating a wireless communicationsystem according to this embodiment.

FIG. 2 is a diagram illustrating the schematic structure of a radioframe according to this embodiment.

FIG. 3 is a diagram illustrating the structure of a slot according tothis embodiment.

FIG. 4 is a diagram illustrating an example of the arrangement ofphysical channels and physical signals in a downlink subframe accordingto this embodiment.

FIG. 5 is a diagram illustrating an example of the arrangement ofphysical channels and physical signals in an uplink subframe accordingto this embodiment.

FIG. 6 is a diagram illustrating an example of the arrangement ofphysical channels and physical signals in a special subframe accordingto this embodiment.

FIG. 7 is a schematic block diagram illustrating the structure of aterminal device 1 according to this embodiment.

FIG. 8 is a schematic block diagram illustrating the structure of a basestation device 3 according to this embodiment.

FIG. 9 is a table illustrating an example of an uplink-downlinkconfiguration in this embodiment.

FIG. 10 is a flowchart illustrating a method for setting a first uplinkreference UL-DL configuration and a first downlink reference UL-DLconfiguration in this embodiment.

FIG. 11 is a flowchart illustrating a method for setting a second uplinkreference UL-DL configuration in this embodiment.

FIG. 12 is a diagram illustrating a correspondence between a pair whichis formed by a first uplink reference UL-DL configuration for anotherserving cell (primary cell) and a first uplink reference UL-DLconfiguration for a serving cell (secondary cell) and a second uplinkreference UL-DL configuration for the secondary cell in this embodiment.

FIG. 13 is a flowchart illustrating a method for setting a seconddownlink reference UL-DL configuration in this embodiment.

FIG. 14 is a diagram illustrating a correspondence between a pair whichis formed by a first downlink reference UL-DL configuration for theprimary cell and a first downlink reference UL-DL configuration for thesecondary cell and a second downlink reference UL-DL configuration forthe secondary cell in this embodiment.

FIG. 15 is a diagram illustrating the relationship between a subframewhich is indicated by the first uplink reference UL-DL configuration anda subframe which is indicated by the first downlink reference UL-DLconfiguration in this embodiment.

FIG. 16 is a diagram illustrating the relationship between the subframewhich is indicated by the first uplink reference UL-DL configuration,the subframe which is indicated by the first downlink reference UL-DLconfiguration, and a subframe which is indicated by a transmissiondirection UL-DL configuration in this embodiment.

FIG. 17 is a diagram illustrating the relationship between the firstuplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration inthis embodiment.

FIG. 18 is a diagram illustrating a correspondence between a subframe nin which a PDCCH/EPDCCH/PHICH is arranged and a subframe n+k in which aPUSCH corresponding to the PDCCH/EPDCCH/PHICH is arranged in thisembodiment.

FIG. 19 is a diagram illustrating a correspondence between a subframe nin which a PHICH is arranged and a subframe n−k in which a PUSCHcorresponding to the PHICH is arranged in this embodiment.

FIG. 20 is a diagram illustrating a correspondence between a subframe nin which a PUSCH is arranged and a subframe n+k in which a PHICHcorresponding to the PUSCH is arranged in this embodiment. The terminaldevice 1 specifies (selects or determines) the value of k according tothe table shown in FIG. 20.

FIG. 21 is a diagram illustrating a correspondence between a subframen−k in which a PDSCH is arranged and a subframe n in which a HARQ-ACKcorresponding to the PDSCH is transmitted in this embodiment.

FIG. 22 is a table showing a coding rate and a modulation methodcorresponding to a CQI index in this embodiment.

FIG. 23 is a diagram showing an example of the structure of a subframeset in this embodiment.

FIG. 24 is a diagram illustrating an example of the subframe set in thisembodiment.

FIG. 25 shows an example of a value of a CSI request field in thisembodiment.

FIG. 26 illustrates an example of a subframe set for a CSI report andthe value of the CSI request field in this embodiment.

FIG. 27 shows an example of the value of the CSI request field in thisembodiment.

FIG. 28 shows an example of the CSI process/subframe set for the CSIreport and the value of the CSI request field in this embodiment.

FIG. 29 shows an example of the value of the CSI request field in thisembodiment.

FIG. 30 shows an example of the CSI process/subframe set for the CSIreport and the value of the CSI request field in this embodiment.

FIG. 31 shows an example of the CSI process/subframe set for the CSIreport and the value of the CSI request field in this embodiment.

FIG. 32 shows an example of the value of the CSI request field in thisembodiment.

FIG. 33 shows an example of the CSI process/subframe set for the CSIreport and the value of the CSI request field in this embodiment.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of the invention will be described.

In this embodiment, a plurality of cells are set to a terminal device. Atechnology in which the terminal device performs communication throughthe plurality of cells is referred to as cell aggregation or carrieraggregation. The present invention may be applied to each of theplurality of cells set to the terminal device. The present invention maybe applied to some of the plurality of set cells. The cell set to theterminal device is also referred to as a serving cell.

The plurality of set cells include one primary cell and one secondarycell or a plurality of secondary cells. The primary cell is a servingcell in which an initial connection establishment procedure isperformed, a serving cell in which a connection re-establishmentprocedure is started, or a cell which is indicated as the primary cellin a handover procedure. The secondary cell may be set in a case thatRRC connection is established or after the RRC connection isestablished.

A time division duplex (TDD) system is applied to a wirelesscommunication system of this embodiment. In cell aggregation, the TDDsystem may be applied to all of the plurality of cells. In the cellaggregation, cells to which the TDD system is applied and cells to whicha frequency division duplex (FDD) system is applied may be aggregated.In a case that the cells to which the TDD system is applied and thecells to which the FDD system is applied are aggregated, the presentinvention may be applied to the cells to which the TDD system isapplied.

In a case that the plurality of cells to which the TDD system is appliedare aggregated, a half-duplex TDD system or a full-duplex TDD system isapplied.

In the half-duplex TDD system, in the plurality of cells to which theTDD system is applied, it is difficult to simultaneously perform uplinktransmission and downlink reception. In the half-duplex TDD system, theterminal device does not simultaneously perform transmission andreception in one primary cell in a certain band, or one primary cell andone secondary cell or a plurality of secondary cells in a plurality ofdifferent bands.

In the full-duplex TDD system, in the plurality of cells to which theTDD system is applied, it is possible to simultaneously perform theuplink transmission and the downlink reception. In the full-duplex TDDsystem, the terminal device can simultaneously perform transmission andreception in the plurality of serving cells in the plurality ofdifferent bands.

The terminal device transmits information indicating combinations ofbands in which the carrier aggregation is supported by the terminaldevice to the base station device. The terminal device transmitsinformation indicating whether or not simultaneous transmission andreception are supported for each of the combinations of the bands in theplurality of serving cells in the plurality of different bands to thebase station device.

In this embodiment, “X/Y” includes the meaning of “X or Y”. In thisembodiment, “X/Y” includes the meaning of “X and Y”. In this embodiment,“X/Y” includes the meaning of “X and/or Y”.

FIG. 1 is a conceptual diagram illustrating a wireless communicationsystem according to this embodiment. In FIG. 1, the wirelesscommunication system includes terminal devices 1A to 1C and a basestation device 3. Hereinafter, the terminal devices 1A to 1C arereferred to as terminal devices 1.

Physical channels and physical signals of this embodiment will bedescribed.

In FIG. 1, in uplink wireless communication from the terminal device 1to the base station device 3, the following uplink physical channels areused. The uplink physical channels are used to transmit informationoutput from a higher layer.

Physical uplink control channel (PUCCH)

Physical uplink shared channel (PUSCH)

Physical random access channel (PRACH)

The PUCCH is a physical channel used to transmit uplink controlinformation (UCI). The uplink control information includes channel stateinformation (CSI) of a downlink, a scheduling request (SR) indicating arequest for a PUSCH resource, and acknowledgement (ACK) and negative ACK(NACK) in response to downlink data (TB: transport block, DL-SCH:Downlink-Shared channel). The ACK/NACK is referred to as HARQ-ACK, HARQfeedback, or response information.

The PUSCH is a physical channel used to transmit uplink data (UL-SCH:Uplink-Shared Channel). The PUSCH may be used to transmit the HARQ-ACKand/or the channel state information together with the uplink data. ThePUSCH may be used to transmit only the channel state information or onlythe HARQ-ACK and the channel state information.

The PRACH is a physical channel used to transmit a random accesspreamble. The PRACH primarily serves to allow the terminal device 1 tobe synchronized with the base station device 3 in the time domain. Inaddition, the PRACH is used to indicate an initial connectionestablishment procedure, a handover procedure, a connectionre-establishment procedure, synchronization of uplink transmission(timing adjustment), and a request for a PUSCH resource.

In FIG. 1, in the uplink wireless communication, the following uplinkphysical signals are used. The uplink physical signal is not used totransmit information output from the higher layer, but is used by aphysical layer.

Uplink reference signal (UL RS)

In this embodiment, the following two types of uplink reference signalsare used.

Demodulation reference signal (DMRS)

Sounding reference signal (SRS)

The DMRS relates to the transmission of the PUSCH or the PUCCH. The DMRSis time-multiplexed with the PUSCH or the PUCCH. The base station device3 uses the DMRS in order to correct the channel of the PUSCH or thePUCCH. Hereinafter, the simultaneous transmission of the PUSCH and theDMRS is simply referred to as the transmission of the PUSCH.Hereinafter, the simultaneous transmission of the PUCCH and the DMRS issimply referred to as the transmission of the PUCCH.

The SRS does not relate to the transmission of the PUSCH or the PUCCH.The base station device 3 uses the SRS in order to measure a channelstate of the uplink. The terminal device 1 transmits a first SRS in afirst resource set by the higher layer. In a case of receivinginformation indicating a request for the transmission of the SRS throughthe PDCCH, the terminal device 1 transmits a second SRS in a secondresource set by the higher layer by only once. The first SRS is referredto as a periodic SRS or a type-0-triggered SRS. The second SRS isreferred to as an aperiodic SRS or a type-1-triggered SRS. Thetransmission of the aperiodic SRS is scheduled with informationindicating the request for the transmission of the SRS.

In FIG. 1, in the downlink wireless communication from the base stationdevice 3 to the terminal device 1, the following downlink physicalchannels are used. The downlink physical channels are used to transmitinformation output from the higher layer.

Physical broadcast channel (PBCH)

Physical control format indicator channel (PCFICH)

Physical hybrid automatic repeat request indicator channel (PHICH)

Physical downlink control channel (PDCCH)

Enhanced physical downlink control channel (EPDCCH)

Physical downlink shared channel (PDSCH)

Physical multicast channel (PMCH)

The PBCH is used to broadcast a master information block (MIB, broadcastchannel (BCH)) which is shared by the terminal devices 1. The MIB istransmitted at an interval of 40 ms. The MIB is repeatedly transmittedwith a period of 10 ms. Specifically, the MIB is initially transmittedin a subframe 0 of a radio frame which satisfies SFN mod 4=0. The MIB isrepeated in a subframe 0 of all of other radio frames. A system framenumber (SFN) is a radio frame number. The MIB is system information. Forexample, the MIB includes information indicating the SFN.

The PCFICH is used to transmit information for designating a region (thenumber of OFDM symbols) which is used to transmit the PDCCH.

The PHICH is used to transmit a HARQ indicator (HARQ feedback orresponse information) which indicates acknowledgement (ACK) or negativeacknowledgement (NACK) of the UL-SCH received by the base station device3. For example, in a case of receiving the HARQ indicator indicating theACK, the terminal device 1 does not re-transmit corresponding uplinkdata. For example, in a case of receiving the HARQ indicator indicatingthe NACK, the terminal device 1 re-transmits corresponding uplink data.A single PHICH transmits the HARQ indicator for a single uplink dataitem. The base station device 3 transmits the HARQ indicators for aplurality of uplink data items which are included in the same PUSCH,using a plurality of PHICHs.

The PDCCH and The EPDCCH are used to transmit downlink controlinformation (DCI). The downlink control information is referred to as aDCI format. The downlink control information includes a downlink grantand an uplink grant. The downlink grant is referred to as downlinkassignment or downlink allocation.

The downlink grant is downlink control information which is used toschedule a single PDSCH in a single cell. The downlink grant is used toschedule the PDSCH in the same subframe as that in which the downlinkgrant is transmitted. The uplink grant is downlink control informationwhich is used to schedule a single PUSCH in a single cell. The uplinkgrant is used to schedule a single PUSCH in a subframe that is four ormore subframes after the subframe in which the uplink grant istransmitted.

A cyclic redundancy check (CRC) parity bit is added to the DCI format.The CRC parity bit is scrambled with a cell-radio network temporaryidentifier (C-RNTI) or a semi persistent scheduling cell-radio networktemporary identifier (SPS C-RNTI). The C-RNTI and the SPS C-RNTI areidentifiers for identifying the terminal device in the cell.

The C-RNTI is used to control the PDSCH or the PUSCH in a singlesubframe. The SPS C-RNTI is used to periodically allocate the PDSCH orPUSCH resources.

The PDSCH is used to transmit downlink data (downlink shared channel:DL-SCH).

The PMCH is used to transmit multicast data (MCH: multicast channel).

In FIG. 1, in the downlink wireless communication, the followingdownlink physical signals are used. The downlink physical signals arenot used to transmit information output from the higher layer, but areused by the physical layer.

Synchronization signal (SS)

Downlink reference signal (DL RS)

The synchronization signals are used to allow the terminal device 1 tobe synchronized in the frequency domain and the time domain of thedownlink. In the TDD system, the synchronization signals are arranged insubframes 0, 1, 5 and 6 of the radio frame. In the FDD system, thesynchronization signals are arranged in subframes 0 and 5 of the radioframe.

The downlink reference signal is used to correct the channel of thedownlink physical channel by the terminal device 1. The downlinkreference signal is used to calculate the channel state information ofthe downlink by the terminal device 1.

In this embodiment, the following five types of downlink referencesignals are used.

Cell-specific reference signal (CRS)

UE-specific reference signal (URS) related to PDSCH

Demodulation reference signal (DMRS) related to EPDCCH

Non-zero power channel state information-reference signal (NZP CSI-RS)

Zero power channel state information-reference signal (ZP CSI-RS)

Multimedia broadcast and multicast service over single frequency networkreference signal (MBSFN RS)

Positioning reference signal (PRS)

The CRS is transmitted in all bands of the subframe. The CRS is used todemodulate the PBCH/PDCCH/PHICH/PCFICH/and the PDSCH. The CRS may beused to calculate the channel state information of the downlink by theterminal device 1. The PBCH/PDCCH/PHICH/and the PCFICH are transmittedthrough an antenna port which is used to transmit the CRS.

The URS related to the PDSCH is transmitted in the subframe and bandwhich are used to transmit the PDSCH related to the URS. The URS is usedto demodulate the PDSCH to which the URS is related.

The PDSCH is transmitted through an antenna port which is used totransmit the CRS or the URS. A DCI format 1A is used to schedule thePDSCH that is transmitted through the antenna port used to transmit theCRS. A DCI format 2D is used to schedule the PDSCH that is transmittedthrough the antenna port used to transmit the URS.

The DMRS related to the EPDCCH is transmitted in the subframe and bandthat are used to transmit the EPDCCH to which the DMRS is related. TheDMRS is used to demodulate the EPDCCH to which the DMRS is related. TheEPDCCH is transmitted through an antenna port which is used to transmitthe DMRS.

The NZP CSI-RS is transmitted in the set subframe. Resources in whichthe NZP CSI-RS is transmitted are set by the base station device. TheNZP CSI-RS is used to calculate the channel state information of thedownlink by the terminal device 1. The terminal device 1 performs signalmeasurement (channel measurement) using the NZP CSI-RS.

The resources of the ZP CSI-RS are set by the base station device 3. Thebase station device 3 transmits the ZP CSI-RS with zero output. That is,the base station device 3 does not transmit the ZP CSI-RS. The basestation device 3 does not transmit the PDSCH and the EPDCCH in the setresources of the ZP CSI-RS. For example, the terminal device 1 canmeasure interference in resources corresponding to the NZP CSI-RS in agiven cell.

The MBSFN RS is transmitted in all bands of the subframe used totransmit the PMCH. The MBSFN RS is used to demodulate the PMCH. The PMCHis transmitted through an antenna port that is used to transmit theMBSFN RS.

The PRS is used to measure a geographical location of the terminaldevice by the terminal device.

The downlink physical channel and the downlink physical signal aregenerically referred to as a downlink signal. The uplink physicalchannel and the uplink physical signal are generically referred to as anuplink signal. The downlink physical channel and the uplink physicalchannel are generically referred to as a physical channel. The downlinkphysical signal and the uplink physical signal are generically referredto as a physical signal.

The BCH, the MCH, the UL-SCH, and the DL-SCH are transport channels. Thechannel which is used in a medium access control (MAC) layer is referredto as a transport channel. The unit of the transport channel used in theMAC layer is also referred to as a transport block (TB) or a MACprotocol data unit (PDU). Hybrid automatic repeat request (HARQ) controlis performed for each transport block in the MAC layer. The transportblock is the unit of data which is transmitted (delivered) by the MAClayer to the physical layer. In the physical layer, the transport blockis mapped to a code word and a coding process is performed for each codeword.

Hereinafter, the structure of the radio frame according to thisembodiment will be described.

FIG. 2 is a diagram illustrating a schematic structure of the radioframe according to this embodiment. Each radio frame has a length of 10ms. In FIG. 2, a horizontal axis represents a time axis. Each radioframe includes two half frames. Each half frame has a length of 5 ms.Each half frame includes five subframes. Each subframe has a length of 1ms, and is defined by two consecutive slots. Each slot has a length of0.5 ms. An i-th subframe in the radio frame includes a (2×i)-th slot anda (2×i+1)-th slot. That is, ten subframes can be used at an interval of10 ms.

In this embodiment, the following three types of subframes are defined:

Downlink subframe (first subframe)

Uplink subframe (second subframe)

Special subframe (third subframe)

The downlink subframe is a subframe reserved for downlink transmission.The uplink subframe is a subframe reserved for uplink transmission. Thespecial subframe includes three fields. The three fields are a downlinkpilot time slot (DwPTS), a guard period (GP), and an uplink pilot timeslot (UpPTS). The total length of the DwPTS, the GP, and the UpPTS is 1ms. The DwPTS is a field which is reserved for downlink transmission.The UpPTS is a field which is reversed for uplink transmission. The GPis a field in which downlink transmission and uplink transmission arenot performed. The special subframe may include only the DwPTS and theGP or the special subframe may include only the GP and the UpPTS.

A single radio frame includes at least the downlink subframe, the uplinksubframe, and the special subframe.

The wireless communication system according to this embodiment supportsa downlink-uplink switch-point periodicity of 5 ms and 10 ms. In a casethat the downlink-uplink switch-point periodicity is 5 ms, the specialsubframe is included in two half frames of the radio frame. In a casethat the downlink-uplink switch-point periodicity is 10 ms, the specialsubframe is included only in the first half frame of the radio frame.

Next, the structure of the slot according to this embodiment will bedescribed.

FIG. 3 is a diagram showing the structure of the slot according to thisembodiment. In this embodiment, a normal cyclic prefix (CP) is appliedto OFDM symbols. An extended cyclic prefix (CP) may be applied to theOFDM symbol. The physical signals or the physical channels transmittedin the respective slots are represented by the resource grids. In FIG.3, a horizontal axis represents a time axis, and a vertical axisrepresents a frequency axis. In the downlink, a resource grid is definedby a plurality of subcarriers and a plurality of OFDM symbols. In theuplink, a resource grid is defined by a plurality of subcarriers and aplurality of SC-FDMA symbols. The number of subcarriers constituting oneslot depends on a bandwidth of the cell. The number of OFDM symbols orSC-FDMA symbols constituting one slot is seven. Each element in theresource grid is referred to as a resource element. The resource elementis identified using a subcarrier number and an OFDM symbol number or aSC-FDMA symbol number.

The resource block is used to represent the mapping of a given physicalchannel (for example, the PDSCH or the PUSCH) to the resource element.For the resource block, a virtual resource block and a physical resourceblock are defined. First, a given physical channel is mapped to thevirtual resource block. Then, the virtual resource block is mapped tothe physical resource block. One physical resource block is defined from7 consecutive OFDM symbols or SC-FDMA symbols in the time domain and 12consecutive fs in the frequency domain. Therefore, one physical resourceblock includes (7×12) resource elements. In addition, one physicalresource block corresponds to one slot in the time domain andcorresponds to 180 kHz in the frequency domain. The physical resourceblock is numbered from 0 in the frequency domain.

Next, the physical channel and the physical signal which are transmittedin each subframe will be described.

FIG. 4 is a diagram illustrating an example of the arrangement of thephysical channels and the physical signals in the downlink subframeaccording to this embodiment. In FIG. 4, a horizontal axis represents atime axis, and a vertical axis represents a frequency axis. The basestation device 3 may transmit the downlink physical channels (PBCH,PCFICH, PHICH, PDCCH, EPDCCH and PDSCH) and the downlink physicalsignals (synchronization signals and downlink reference signals) in thedownlink subframe. The PBCH is transmitted in only subframe 0 of theradio frame. The downlink reference signals are arranged in the resourceelements that are distributed in the frequency domain and the timedomain. For the sake of convenience in description, the downlinkreference signals are not illustrated in FIG. 4.

In a PDCCH region, frequency multiplexing and time multiplexing may beperformed on a plurality of PDCCHs. In an EPDCCH region, frequencymultiplexing, time multiplexing, and spatial multiplexing may beperformed on a plurality of EPDCCHs. In a PDSCH region, frequencymultiplexing and spatial multiplexing may be performed on a plurality ofPDSCHs. Time multiplexing may be performed on the PDCCH and the PDSCH orthe EPDCCH. Frequency multiplexing may be performed on the PDSCH and theEPDCCH.

FIG. 5 is a diagram showing an example of the arrangement of thephysical channels and the physical signals in the uplink subframeaccording to this embodiment. In FIG. 5, a horizontal axis is a timeaxis, and a vertical axis is a frequency axis. The terminal device 1 maytransmit the uplink physical channels (PUCCH, PUSCH and PRACH) and theuplink physical signals (DMRS and SRS) in the uplink subframe. In aPUCCH region, frequency multiplexing, time multiplexing and codemultiplexing are performed on a plurality of PUCCHs. In a PUSCH region,frequency multiplexing and spatial multiplexing may be performed on aplurality of PUSCHs. Frequency multiplexing may be performed on thePUCCH and the PUSCH. The PRACHs may be arranged in a single subframe orover two subframes. Code multiplexing may be performed on the pluralityof PRACHs.

The SRS is transmitted using the last SC-FDMA symbol in the uplinksubframe. That is, the SRS is arranged in the last SC-FDMA symbol of theuplink subframe. The terminal device 1 is not capable of transmittingthe SRS and the PUCCH/PUSCH/PRACH at the same time with a single SC-FDMAsymbol of a single cell. The terminal device 1 can transmit the PUSCHand/or the PUCCH using an SC-FDMA symbol except for the last SC-FDMAsymbol in a single uplink subframe of a single cell and transmit the SRSusing the last SC-FDMA symbol in the uplink subframe. That is, theterminal device 1 can transmit both the SRS and the PUSCH/PUCCH in thesingle uplink subframe of the single cell. Time multiplexing isperformed on the DMRS and the PUCCH or the PUSCH. For simplicity ofillustration, the DMRS is not shown in FIG. 5.

FIG. 6 is a diagram showing an example of the arrangement of thephysical channels and the physical signals in the special subframeaccording to this embodiment. In FIG. 6, a horizontal axis represents atime axis, and a vertical axis represents a frequency axis. In FIG. 6,the DwPTS includes first to tenth SC-FDMA symbols in the specialsubframe, the GP includes eleventh and twelfth SC-FDMA symbols in thespecial subframe, and the UpPTS includes thirteenth and fourteenthSC-FDMA symbols in the special subframe.

The base station device 3 may transmit the PCFICH, the PHICH, the PDCCH,the EPDCCH, the PDSCH, the synchronization signal, and the downlinkreference signal in the DwPTS of the special subframe. The base stationdevice 3 does not transmit the PBCH in the DwPTS of the specialsubframe. The terminal device 1 may transmit the PRACH and the SRS inUpPTS of the special subframe. That is, the terminal device 1 does nottransmit the PUCCH, the PUSCH, and the DMRS in the UpPTS of the specialsubframe.

FIG. 7 is a schematic block diagram showing the structure of theterminal device 1 according to this embodiment. As illustrated in thedrawing, the terminal device 1 includes a higher layer processing unit101, a control unit 103, a reception unit 105, a transmission unit 107,and a transmit/receive antenna 109. The higher layer processing unit 101includes a radio resource control unit 1011, a subframe setting unit1013, a scheduling information interpretation unit 1015, and a channelstate information (CSI) reporting control unit 1017. The reception unit105 includes a decoding unit 1051, a demodulation unit 1053, ademultiplexing unit 1055, a radio reception unit 1057, and a channelmeasurement unit 1059. The transmission unit 107 includes a coding unit1071, a modulation unit 1073, a multiplexing unit 1075, a radiotransmission unit 1077, and an uplink reference signal generation unit1079.

The higher layer processing unit 101 outputs uplink data (transportblock) generated by, for example, the operation of the user to thetransmission unit 107. The higher layer processing unit 101 processes aMAC layer, a packet data convergence protocol (PDCP) layer, a radio linkcontrol (RLC) layer, and a radio resource control (RRC) layer.

The radio resource control unit 1011 of the higher layer processing unit101 manages various kinds of setting information of the terminal device.In addition, the radio resource control unit 1011 generates informationto be arranged in each uplink channel and outputs the information to thetransmission unit 107.

The subframe setting unit 1013 of the higher layer processing unit 101manages a first uplink reference UL-DL configuration (uplink referenceconfiguration), a first downlink reference UL-DL configuration (downlinkreference configuration), a second uplink reference UL-DL configuration,a second downlink reference UL-DL configuration, and a transmissiondirection UL-DL configuration (transmission direction configuration).

The subframe setting unit 1013 sets the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, thesecond uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and the transmission direction UL-DLconfiguration. The subframe setting unit 1013 sets at least two subframesets.

The scheduling information interpretation unit 1015 of the higher layerprocessing unit 101 interprets the DCI format (scheduling information)which is received through the reception unit 105, generates controlinformation for controlling the reception unit 105 and the transmissionunit 107 on the basis of the interpretation result of the DCI format,and outputs the control information to the control unit 103.

In addition, the scheduling information interpretation unit 1015determines the time when the transmitting process and the receivingprocess are performed, on the basis of the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, thesecond uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration.

The CSI reporting control unit 1017 specifies a CSI reference resource.The CSI reporting control unit 1017 instructs the channel measurementunit 1059 to derive a CQI related to the CSI reference resource. The CSIreporting control unit 1017 instructs the transmission unit 107 totransmit the CQI. The CSI reporting control unit 1017 sets theconfiguration used in a case that the CQI is calculated by the channelmeasurement unit 1059.

The control unit 103 generates control signals for controlling thereception unit 105 and the transmission unit 107, on the basis of thecontrol information from the higher layer processing unit 101. Thecontrol unit 103 outputs the generated control signals to the receptionunit 105 and the transmission unit 107 to control the reception unit 105and the transmission unit 107.

The reception unit 105 performs demultiplexing, demodulation, anddecoding on the signal which is received from the base station device 3through the transmit/receive antenna 109 in response to the controlsignal input from the control unit 103 and outputs the decodedinformation to the higher layer processing unit 101.

The radio reception unit 1057 converts (down-conversion) the downlinksignal received through the transmit/receive antenna 109 into a basebandsignal through orthogonal demodulation to remove an unnecessaryfrequency component, controls an amplification level such that a signallevel is appropriately maintained, performs the orthogonal demodulationon the signal on the basis of the orthogonal component and an in-phasecomponent of the received signal, and converts theorthogonal-demodulated analog signal into a digital signal. The radioreception unit 1057 performs a fast Fourier transform (FFT) on a signalobtained by removing a cyclic prefix (CP) guard interval (referred to asa GI) from the converted digital signal, and extracts a signal of thefrequency domain.

The demultiplexing unit 1055 demultiplexes the extracted signal into thePHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink referencesignal. In addition, the demultiplexing unit 1055 compensates for thechannel of the PHICH, the PDCCH, the EPDCCH, and the PDSCH from theestimated value of the channel which is input from the channelmeasurement unit 1059. The demultiplexing unit 1055 outputs thedemultiplexed downlink reference signal to the channel measurement unit1059.

The demodulation unit 1053 multiplies the PHICH by a corresponding codeto synthesize them, demodulates the synthesized signal using a binaryphase shift keying (BPSK) modulation method, and outputs the demodulatedsignal to the decoding unit 1051. The decoding unit 1051 decodes thePHICH addressed to the terminal device and outputs the decoded HARQindicator to the higher layer processing unit 101. The demodulation unit1053 demodulates the PDCCH and/or the EPDCCH using a QPSK modulationmethod and outputs the demodulated PDCCH and/or EPDCCH to the decodingunit 1051. The decoding unit 1051 tries to decode the PDCCH and/or theEPDCCH. In a case that decoding has succeeded, the decoding unit 1051outputs the decoded downlink control information and the RNTIcorresponding to the downlink control information to the higher layerprocessing unit 101.

The demodulation unit 1053 demodulates the PDSCH using a modulationmethod notified by the downlink grant, such as quaternary PSK (QPSK)modulation, 16-quadrature amplitude modulation (QAM), or 64 QAM, andoutputs the demodulated PDSCH to the decoding unit 1051. The decodingunit 1051 performs decoding on the basis of information about the codingrate notified by downlink control information and outputs the decodeddownlink data (TB) to the higher layer processing unit 101.

The channel measurement unit 1059 measures downlink path loss or adownlink channel state from the downlink reference signal which is inputfrom the demultiplexing unit 1055 and outputs the measured downlink pathloss or channel state to the higher layer processing unit 101. Thechannel measurement unit 1059 calculates the estimated value of thechannel of the downlink channel from the downlink reference signal andoutputs the estimated value to the demultiplexing unit 1055. The channelmeasurement unit 1059 performs channel measurement and/or interferencemeasurement in order to calculate the CQI.

The transmission unit 107 generates an uplink reference signal inresponse to the control signal input from the control unit 103, codesand modulates the uplink data (TB) input from the higher layerprocessing unit 101, multiplexes the PUCCH, the PUSCH, and the generateduplink reference signal, and transmits the multiplexed signal to thebase station device 3 through the transmit/receive antenna 109.

The coding unit 1071 performs coding, such as convolution cording orblock coding, on the uplink control information input from the higherlayer processing unit 101. In addition, the coding unit 1071 performsturbo cording on the basis of the information used to schedule thePUSCH.

The modulation unit 1073 modulates coded bits input from the coding unit1071 using a modulation method notified by downlink control informationsuch as BPSK, QPSK, 16 QAM and 64 QAM or a modulation method determinedin advance for each channel. The modulation unit 1073 determines thenumber of data sequences on which spatial multiplexing is performedbased on information used for scheduling of the PUSCH, maps a pluralityof uplink data items transmitted on the same PUSCH to a plurality ofsequences by using multiple-input multiple-output (MIMO) spatialmultiplexing (SM), and performs precoding on the sequences.

The uplink reference signal generation unit 1079 generates sequencesobtained by a predetermined rule (expression) on the basis of a physicalcell identity (PCI, referred to as a cell ID) for identifying the basestation device 3, a bandwidth in which the uplink reference signal isarranged, a cyclic shift notified by the uplink grant, and a parametervalue for generating the DMRS sequence. The multiplexing unit 1075rearranges modulated symbols of the PUSCH in parallel in response to thecontrol signals input from the control unit 103 and performs a discreteFourier transform (DFT) on the rearranged symbols. The multiplexing unit1075 multiplexes the PUCCH and PUSCH signals and the generated uplinkreference signal for each transmit antenna port. That is, themultiplexing unit 1075 arranges the PUCCH and PUSCH signals and thegenerated uplink reference signal in the resource elements for eachtransmit antenna port.

The radio transmission unit 1077 performs an inverse fast Fouriertransform (IFFT) on the multiplexed signals to generate the SC-FDMAsymbols, adds the CP to the generated SC-FDMA symbol to generate abaseband digital signal, and converts the baseband digital signal intoan analog signal. Thereafter, the radio transmission unit generates anin-phase component and an orthogonal component of an intermediatefrequency from the analog signal, removes extra frequency components foran intermediate frequency band, and converts (up-conversion) a signalhaving an intermediate frequency into a signal having a high frequency.Subsequently, the radio transmission unit removes extra frequencycomponents, amplifies a power, and transmits the amplified signal to thetransmit/receive antenna 109.

FIG. 8 is a schematic block diagram illustrating the structure of thebase station device 3 according to this embodiment. As illustrated inthe drawing, the base station device 3 includes a higher layerprocessing unit 301, a control unit 303, a reception unit 305, atransmission unit 307, and a transmit/receive antenna 309. The higherlayer processing unit 301 includes a radio resource control unit 3011, asubframe setting unit 3013, a scheduling unit 3015, and a CSI reportingcontrol unit 3017. The reception unit 305 includes a decoding unit 3051,a demodulation unit 3053, a demultiplexing unit 3055, a radio receptionunit 3057, and a channel measurement unit 3059. The transmission unit307 includes a coding unit 3071, a modulation unit 3073, a multiplexingunit 3075, a radio transmission unit 3077, and a downlink referencesignal generation unit 3079.

The higher layer processing unit 301 processes a MAC layer, a PDCPlayer, a RLC layer, and a RRC layer. In addition, the higher layerprocessing unit 301 generates control information for controlling thereception unit 305 and the transmission unit 307 and outputs the controlinformation to the control unit 303.

The radio resource control unit 3011 of the higher layer processing unit301 generates, for example, downlink data (transport block), systeminformation, an RRC message, and a MAC control element (CE) to bearranged in downlink PDSCH or acquires a higher node and outputs thegenerated data or the acquired higher node to the transmission unit 307.In addition, the radio resource control unit 3011 manages various kindsof setting information of the terminal device 1.

The subframe setting unit 3013 of the higher layer processing unit 301manages the first uplink reference UL-DL configuration, the firstdownlink reference UL-DL configuration, the second uplink referenceUL-DL configuration, the second downlink reference UL-DL configuration,and the transmission direction UL-DL configuration for each terminaldevice 1.

The subframe setting unit 3013 sets the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, thesecond uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and the transmission direction UL-DLconfiguration to each terminal device 1.

The subframe setting unit 3013 generates first information indicatingthe first uplink reference UL-DL configuration, second informationindicating the first downlink reference UL-DL configuration, and thirdinformation indicating the transmission direction UL-DL configuration.The subframe setting unit 3013 transmits the first information, thesecond information, and the third information to the terminal device 1through the transmission unit 307.

The base station device 3 may determine the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, thesecond uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration for the terminal device 1. In addition, the base stationdevice 3 may determine the first uplink reference UL-DL configuration,the first downlink reference UL-DL configuration, the second uplinkreference UL-DL configuration, the second downlink reference UL-DLconfiguration, and/or the transmission direction UL-DL configuration forthe terminal device 1 in response to instructions from a higher node.

For example, the subframe setting unit 3013 may determine the firstuplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, the second uplink reference UL-DL configuration, thesecond downlink reference UL-DL configuration and/or the transmissiondirection UL-DL configuration on the basis of an uplink traffic amountand a downlink traffic amount.

The subframe setting unit 3013 manages at least two subframe sets. Thesubframe setting unit 3013 may set at least two subframe sets to eachterminal device 1. The subframe setting unit 3013 may set at least twosubframe sets to each serving cell. The subframe setting unit 3013 mayset at least two subframe sets to each CSI process.

The subframe setting unit 3013 transmits information indicating at leasttwo subframe sets to the terminal device 1 through the transmission unit307.

The scheduling unit 3015 of the higher layer processing unit 301determines a frequency and a subframe to which the physical channels(PDSCH and PUSCH) are allocated, a coding rate, a modulation method ofthe physical channels (PDSCH and PUSCH) and a transmission power fromthe received channel state information, the channel quality and theestimated value of the channel input from the channel measurement unit3059. The scheduling unit 3015 determines whether to schedule thedownlink physical channel and/or the downlink physical signal or toschedule the uplink physical channel and/or the uplink physical signalin the flexible subframe. The scheduling unit 3015 generates controlinformation (for example, a DCI format) for controlling the receptionunit 305 and the transmission unit 307 on the basis of the schedulingresult, and outputs the generated control information to the controlunit 303.

The scheduling unit 3015 generates information which is used to schedulethe physical channels (the PDSCH and the PUSCH) on the basis of thescheduling result. In addition, the scheduling unit 3015 determines thetime when the transmitting process and the receiving process areperformed, on the basis of the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, thesecond uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and/or the transmission direction UL-DLconfiguration.

The CSI reporting control unit 3017 of the higher layer processing unit301 controls a CSI report of the terminal device 1. The CSI reportingcontrol unit 3017 transmits information indicating variousconfigurations assumed to derive the CQI in the CSI reference resourceby the terminal device 1 to the terminal device 1 through thetransmission unit 307.

The control unit 303 generates control signals for controlling thereception unit 305 and the transmission unit 307, on the basis of thecontrol information from the higher layer processing unit 301. Thecontrol unit 303 outputs the generated control signals to the receptionunit 305 and the transmission unit 307 to control the reception unit 305and the transmission unit 307.

The reception unit 305 performs demultiplexing, demodulation anddecoding on the reception signal received from the terminal device 1through the transmit/receive antenna 309 in response to the controlsignals input from the control unit 303, and outputs the decodedinformation to the higher layer processing unit 301. The radio receptionunit 3057 converts the uplink signal received through thetransmit/receive antenna 309 into a baseband signal through downconversion, and removes unnecessary frequency components. Thereafter,the radio reception unit controls an amplification level such that thesignal level is appropriately maintained, performs orthogonaldemodulation on the signal on the basis of the in-phase component andthe orthogonal component of the received signal, and converts theorthogonal-demodulated analog signal into a digital signal.

The radio reception unit 3057 removes a portion corresponding to CP fromthe converted digital signal. The radio reception unit 3057 performsfast Fourier transform (FFT) on the signal from which the guard intervalhas been removed, extracts a signal in the frequency domain, and outputsthe extracted signal to the demultiplexing unit 3055.

The demultiplexing unit 1055 demultiplexes the signal input from theradio reception unit 3057 into signals, such as the PUCCH, the PUSCH,and the uplink reference signal. The demultiplexing process isdetermined by the radio resource control unit 3011 of the base stationdevice 3 in advance and is performed on the basis of the allocationinformation of the radio resources included in the uplink grant which isnotified to each terminal device 1. In addition, the demultiplexing unit3055 compensates for the channels of the PUCCH and the PUSCH from theestimated value of the channel input from the channel measurement unit3059. The demultiplexing unit 3055 outputs the demultiplexed uplinkreference signal to the channel measurement unit 3059.

The demodulation unit 3053 performs inverse discrete Fourier transform(IDFT) on the PUSCH to acquire modulated symbols, and demodulates thereceived signal using a modulation method which is predetermined foreach of the modulated symbols of the PUCCH and the PUSCH, apredetermined modulation method such as BPSK, QPSK, 16 QAM, or 64 QAM,or a modulation method which is notified from the base station device toeach terminal device 1 with the uplink grant in advance. Thedemodulation unit 3053 demultiplexes the modulated symbols of aplurality of uplink data items which are transmitted through the samePUSCH by the MIMO SM, on the basis of the number of spatial-multiplexedsequences, which are notified to each terminal device 1 by the uplinkgrant in advance, and information indicating precoding for thesequences.

The decoding unit 3051 decodes the coded bits of the demodulated PUCCHand PUSCH at a predetermined coding rate of a predetermined codingmethod or a coding rate which is notified from the base station deviceto the terminal device 1 with the uplink grant in advance and outputsthe decoded uplink data and the uplink control information to the higherlayer processing unit 101. In a case that the PUSCH is retransmitted,the decoding unit 3051 performs decoding using the coded bits, whichhave been input from the higher layer processing unit 301 and thenstored in an HARQ buffer, and the demodulated coded bits. The channelmeasurement unit 309 measures, for example, the estimated value of thechannel and the quality of the channel from the uplink reference signalwhich is input from the demultiplexing unit 3055 and outputs themeasured values to the demultiplexing unit 3055 and the higher layerprocessing unit 301.

The transmission unit 307 generates a downlink reference signal,performs coding and modulation on the HARQ indicator, downlink controlinformation, and downlink data input from the higher layer processingunit 301, multiplexes the PHICH, the PDCCH, the EPDCCH, the PDSCH, andthe downlink reference signal, and transmits the signals to the terminaldevice 1 through the transmit/receive antenna 309, in response to thecontrol signal input from the control unit 303.

The coding unit 3071 codes the HARQ indicator, downlink controlinformation, and downlink data input from the higher layer processingunit 301 using a predetermined coding method, such as block coding,convolution coding, or turbo coding, or the coding method determined bythe radio resource control unit 3011. The modulation unit 3073 modulatesthe coded bits input from the coding unit 3071 using a predeterminedmodulation method, such as BPSK, QPSK, 16 QAM, or 64 QAM, or themodulation method determined by the radio resource control unit 3011.

The downlink reference signal generation unit 3079 generates, as thedownlink reference signal, the sequence which has been known to theterminal device 1 and is calculated according to a predetermined rule onthe basis of, for example, a physical cell identity (PCI) foridentifying the base station device 3. The multiplexing unit 3075multiplexes the modulated symbol of each modulated channel and thegenerated downlink reference signal. That is, the multiplexing unit 3075arranges the modulated symbol of each modulated channel and thegenerated downlink reference signal in the resource elements.

The radio transmission unit 3077 performs inverse fast Fourier transform(IFFT) on the multiplexed modulated symbol, performs modulation usingthe OFDM method, and adds the guard interval to the OFDM symbol on whichthe OFDM modulation has been performed. Subsequently, the radiotransmission unit generates a baseband digital signal, converts thebaseband digital signal into an analog signal, removes extra frequencycomponents by a low pass filter, and performs up-conversion into acarrier frequency. Thereafter, the radio transmission unit amplifies apower, and outputs and transmits the amplified power through thetransmit/receive antenna 309.

Next, the first uplink reference uplink-downlink configuration (uplinkreference UL-DL configuration), the first downlink referenceuplink-downlink configuration (downlink reference UL-DL configuration),the second uplink reference UL-DL configuration, the second downlinkreference UL-DL configuration, and the transmission directionuplink-downlink configuration (transmission direction UL-DLconfiguration) will be described.

The first uplink reference UL-DL configuration, the first downlinkreference UL-DL configuration, the second uplink reference UL-DLconfiguration, the second downlink reference UL-DL configuration, andthe transmission direction UL-DL configuration are defined byuplink-downlink configuration (UL-DL configuration).

The uplink-downlink configuration is a configuration related to apattern of the subframe in the radio frame. The uplink-downlinkconfiguration indicates that each subframe in the radio frame is any oneof the downlink subframe, the uplink subframe and the special subframe.

That is, the first uplink reference UL-DL configuration, the seconduplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, the second downlink reference UL-DL configuration, andthe transmission direction UL-DL configuration are defined by a patternof the downlink subframes, the uplink subframes and the specialsubframes in the radio frame.

The pattern of the downlink subframe, the uplink subframe and thespecial subframe indicates that each of subframes #0 to #9 is any one ofthe downlink subframe, the uplink subframe and the special subframe.Preferably, the pattern thereof is represented by any combination inwhich D, U and S (respectively indicating the downlink subframe, theuplink subframe and the special subframe) have a length of 10. Morepreferably, a head (that is, a subframe #0) is D, and a second (that is,a subframe 1) is S.

FIG. 9 is a table illustrating an example of the uplink-downlinkconfiguration according to this embodiment. In FIG. 9, D indicates thedownlink subframe, U indicates the uplink subframe, and S indicates thespecial subframe.

In FIG. 9, a subframe 1 in the radio frame is constantly the specialsubframe. In FIG. 9, subframes 0 and 5 are constantly reserved fordownlink transmission, and a subframe 2 is constantly reversed foruplink transmission.

In FIG. 9, in a case that the downlink-uplink switch-point periodicityis 5 ms, a subframe 6 in the radio frame is the special subframe. In acase that the downlink-uplink switch-point periodicity is 10 ms, thesubframe 6 in the radio frame is the downlink subframe.

The first uplink reference UL-DL configuration is also referred to as afirst parameter, a first configuration, or a serving celluplink-downlink configuration. The first downlink reference UL-DLconfiguration is also referred to as a second parameter or a secondconfiguration. The second uplink reference UL-DL configuration is alsoreferred to as a third parameter or a third configuration. The seconddownlink reference UL-DL configuration is also referred to as a fourthparameter or a fourth configuration. The transmission direction UL-DLconfiguration is also referred to as a fifth parameter or a fifthconfiguration.

The setting of uplink-downlink configuration i as the first or seconduplink reference UL-DL configuration is referred to the setting of firstor second uplink reference UL-DL configuration i. The setting ofuplink-downlink configuration i as the first or second downlinkreference UL-DL configuration is referred to as the setting of first orsecond downlink reference UL-DL configuration i. The setting ofuplink-downlink configuration i as the transmission direction UL-DLconfiguration is referred to as the setting of transmission directionUL-DL configuration i.

Next, a method for setting the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration will be described.

The base station device 3 sets the first uplink reference UL-DLconfiguration, the first downlink reference UL-DL configuration, and thetransmission direction UL-DL configuration. The base station device 3may insert first information (TDD-Config) indicating the first uplinkreference UL-DL configuration, second information indicating the firstdownlink reference UL-DL configuration, and third information indicatingthe transmission direction UL-DL configuration into at least one of anMIB, a system information block type 1 message, a system informationmessage, an RRC message, a MAC control element (CE), and physical layercontrol information (for example, a DCI format) and transmit theinformation items. In addition, the base station device 3 may insert thefirst information, the second information, and the third informationinto any one of the MIB, the system information block type 1 message,the system information message, the RRC message, the MAC control element(CE), and the physical layer control information (for example, a DCIformat), depending on the situation.

The first uplink reference UL-DL configuration, the second uplinkreference UL-DL configuration, the first downlink reference UL-DLconfiguration, the second downlink reference UL-DL configuration, andthe transmission direction UL-DL configuration may be defined for eachof a plurality of serving cells.

The base station device 3 transmits the first information, the secondinformation, and the third information for each serving cell to theterminal device 1 to which the plurality of serving cells are set.However, the first information, the second information, and the thirdinformation may be defined for each serving cell.

The base station device 3 may transmit first information on a primarycell, second information on the primary cell, third information on theprimary cell, first information on a secondary cell, second informationon the secondary cell, and third information on the secondary cell tothe terminal device 1 to which two serving cells, that is, one primarycell and one secondary cell are set.

The terminal device 1 to which a plurality of serving cells are set mayset the first uplink reference UL-DL configuration, the first downlinkreference UL-DL configuration, and the transmission direction DL-ULconfiguration to each serving cell on the basis of the firstinformation, the second information, and the third information.

The terminal device 1 to which two serving cells, that is, one primarycell and one secondary cell are set may set the first uplink referenceUL-DL configuration for the primary cell, the first downlink referenceUL-DL configuration for the primary cell, the transmission directionDL-UL configuration for the primary cell, the first uplink referenceUL-DL configuration for the secondary cell, the first downlink referenceUL-DL configuration for the secondary cell, and the transmissiondirection DL-UL configuration for the secondary cell.

It is preferable that the first information on the primary cell beincluded in the system information block type 1 message or the RRCmessage. It is preferable that the first information on the secondarycell be included in the RRC message. It is preferable that the secondinformation on the primary cell be included in the system informationblock type 1 message, the system information message, or the RRCmessage. It is preferable that the second information on the secondarycell be included in the RRC message. It is preferable that the thirdinformation be included in the physical layer control information (forexample, a DCI format).

It is preferable that the first information be common to a plurality ofterminal devices 1 in the cell. The second information may be common tothe plurality of terminal devices 1 in the cell or it may be used onlyfor the terminal device 1. The third information may be common to theplurality of terminal devices 1 in the cell or it may be used only forthe terminal device 1.

The system information block type 1 message is initially transmittedthrough the PDSCH in a subframe 5 of a radio frame which satisfies SFNmod 8=0, and is repeated in subframes 5 of the other radio frames whichsatisfy SFN mod 2=0. The system information block type 1 messageincludes information indicating the structure of the special subframe(lengths of DwPTS, GP and UpPTS). The system information block type 1message is information unique to the cell.

The system information message is transmitted through the PDSCH. Thesystem information message is information unique to the cell. The systeminformation message includes system information block X in addition tothe system information block type 1.

The RRC message is transmitted through the PDSCH. The RRC message isinformation/signal which is processed in the RRC layer. The RRC messagemay be common to the plurality of terminal devices 1 in the cell or itmay be used only for a specific terminal device 1.

The MAC CE is transmitted through the PDSCH. The MAC CE isinformation/signal which is processed in the MAC layer.

In a case of receiving the physical layer control information (forexample, a DCI format) including the first information and/or the secondinformation and/or the third information through the downlink physicalchannel (for example, PDCCH/EPDCCH) in a subframe n−k, it is preferablethat the terminal device 1 set (validate) the first uplink referenceUL-DL configuration and/or the first downlink reference UL-DLconfiguration and/or the transmission direction UL-DL configuration in asubframe n. For example, k is 4 or 8. For example, a subframe n+k isused to transmit the HARQ-ACK (ACK) for the downlink physical channel(for example, PDCCH/EPDCCH) which is used to transmit the physical layercontrol information (for example, a DCI format). For example, k isdetermined on the basis of the table shown in FIG. 21 and the currentfirst or second downlink reference UL-DL configuration.

In a case of receiving the physical layer control information (forexample, a DCI format) including the third information in a radio framen−k through the downlink physical channel (for example, PDCCH/EPDCCH),it is preferable that the terminal device 1 set (validate) thetransmission direction UL-DL configuration in a radio frame n. Forexample, k is 1. The third information received in the radio frame n−kmay be valid only for the radio frame n.

FIG. 10 is a flowchart illustrating a method for setting the firstuplink reference UL-DL configuration and the first downlink referenceUL-DL configuration in this embodiment. The terminal device 1 performsthe setting method shown in FIG. 10 for each of a plurality of servingcells.

The terminal device 1 sets the first uplink reference UL-DLconfiguration to a given serving cell on the basis of the firstinformation (S1000). The terminal device 1 determines whether the secondinformation on the given serving cell is received (S1002). In a casethat the second information on the given serving cell is received, theterminal device 1 sets the first downlink reference UL-DL configurationto the given serving cell on the basis of the second information on thegiven serving cell (S1006). In a case that the second information on thegiven serving cell is not received (else/otherwise), the terminal device1 sets the first downlink reference UL-DL configuration to the givenserving cell on the basis of the first information on the given servingcell (S1004).

The serving cell to which the first uplink reference UL-DL configurationand the first downlink reference UL-DL configuration are set on thebasis of the first information is referred to as a serving cell to whicha dynamic TDD is not set. The serving cell to which the first downlinkreference UL-DL configuration is set on the basis of the secondinformation is referred to as a serving cell to which the dynamic TDD isnot set.

The terminal device 1 receives the second information, and determines asubframe capable of transmitting an uplink signal on the basis of thesecond information. Thereafter, the terminal device 1 monitors the thirdinformation. In a case of receiving the third information, the terminaldevice 1 determines a subframe capable of transmitting an uplink signalon the basis of the third information.

For example, the base station device 3 transmits the third informationto the terminal device 1 by using the PDCCH/EPDCCH. The thirdinformation controls an operation of the dynamic TDD within coverage ofthe base station device 3 (cell). The third information is transmittedand received in a common search space (CSS) or an UE-specific searchspace (USS).

The CSS is a region where the PDCCH/EPDCCH is monitored in common by theplurality of terminal devices 1. The USS is a region that is definedbased on at least C-RNTI. The C-RNTI is an identifier that is allocateduniquely to the terminal device 1.

The C-RNTI may be used to transmit the DCI format including the thirdinformation (information designating a transmission direction for asubframe). The RNTI different from the C-RNTI and the SPS C-RNTI may beused to transmit the DCI format including the third information(information designating a transmission direction for a subframe). TheRNTI is referred to as an X-RNTI. That is, the CRC parity bit added tothe DCI format including information of the third information isscrambled with the C-RNTI or the X-RNTI.

The subframe that monitors the PDCCH/EPDCCH including the thirdinformation by the terminal device 1 may be restricted. The base stationdevice 3 may control the subframe that monitors the PDCCH/EPDCCHincluding the third information by the terminal device 1. The basestation device 3 may transmit information designating the subframe thatmonitors the PDCCH/EPDCCH including the third information by theterminal device 1 to the terminal device 1.

For example, the PDCCH/EPDCCH including the third information may bearranged at an interval of 10 subframes. For example, the terminaldevice 1 monitors the third information at an interval of 10 subframes.The subframes where the PDCCH/EPDCCH including the third information maybe arranged may be determined in advance. For example, the thirdinformation may be arranged at the subframe 0 or 5 of the radio frame.

The terminal device 1 that starts the operation of the dynamic TDDmonitors the PDCCH/EPDCCH including the third information in thesubframe where the PDCCH/EPDCCH including the third information may bearranged.

The terminal device 1 tries to perform decoding on the received signal,and determines whether or not the PDCCH/EPDCCH including the thirdinformation is detected. In a case that the PDCCH/EPDCCH including thethird information is detected, the terminal device 1 determines thesubframe capable of transmitting the uplink signal on the basis of thedetected third information. In a case that the PDCCH/EPDCCH includingthe third information is not detected, the terminal device 1 maymaintain the determination that has been performed so far on thesubframe capable of transmitting the uplink signal.

Next, a method for setting the second uplink reference UL-DLconfiguration will be described.

In a case that the plurality of serving cells are set to the terminaldevice 1 and the first uplink reference UL-DL configurations for atleast two serving cells are different, the terminal device 1 and thebase station device 3 set the second uplink reference UL-DLconfigurations.

Except a case that the plurality of serving cells are set to theterminal device 1 and the first uplink reference UL-DL configurationsfor at least two serving cells are different, the terminal device 1 andthe base station device 3 may not set the second uplink reference UL-DLconfigurations.

Except a case that the first uplink reference UL-DL configurations forat least two serving cells are different, the first uplink referenceUL-DL configurations for all serving cells are the same. In a case thatone serving cell is set to the terminal device 1, the terminal device 1and the base station device 3 may not set the second uplink referenceUL-DL configurations.

Except a case that the first uplink reference UL-DL configurations forat least two serving cells are different, the first uplink referenceUL-DL configurations for all serving cells are the same. In a case thatone serving cell is set to the terminal device 1, the terminal device 1and the base station device 3 may not set the second uplink referenceUL-DL configurations.

FIG. 11 is a flowchart illustrating a method for setting the seconduplink reference UL-DL configuration in this embodiment. In FIG. 11, oneprimary cell and one secondary cell are set to the terminal device 1.The terminal device 1 performs the setting method of FIG. 11 on theprimary cell and the secondary cell.

The terminal device 1 determines whether or not the first uplinkreference UL-DL configuration for the primary cell and the first uplinkreference UL-DL configuration for the secondary cell are different(S1100). In a case that the first uplink reference UL-DL configurationfor the primary cell and the first uplink reference UL-DL configurationfor the secondary cell are the same, the terminal device 1 ends aprocess of setting the second uplink reference UL-DL configurationwithout setting the second uplink reference UL-DL configuration.

In a case that the first uplink reference UL-DL configuration for theprimary cell is different from the first uplink reference UL-DLconfiguration for the secondary cell, the terminal device 1 determineswhether the serving cell is the primary cell or the secondary celland/or whether the terminal device 1 is configured so as to monitor thePDCCH/EPDCCH with a carrier indicator field (CIF) corresponding to theserving cell in the other serving cell (S1102).

In a case that the serving cell is the secondary cell and the terminaldevice 1 is configured so as to monitor the PDCCH/EPDCCH with the CIFcorresponding to the serving cell (secondary cell) in the other servingcell (primary cell), the terminal device 1 sets the second uplinkreference UL-DL configuration for the serving cell (secondary cell) onthe basis of a pair which is formed by the first uplink reference UL-DLconfiguration for the other serving cell (primary cell) and the firstuplink reference UL-DL configuration for the serving cell (secondarycell) (S1104).

In S1104, the terminal device 1 sets the second uplink reference UL-DLconfiguration for the serving cell (secondary cell) on the basis of thetable shown in FIG. 12. FIG. 12 is a diagram illustrating thecorrespondence between the pair which is formed by the first uplinkreference UL-DL configuration for the other serving cell (primary cell)and the first uplink reference UL-DL configuration for the serving cell(secondary cell) and the second uplink reference UL-DL configuration forthe secondary cell in this embodiment.

In FIG. 12, the primary cell UL-DL configuration refers to the firstuplink reference UL-DL configuration for the other serving cell (primarycell). In FIG. 12, the secondary cell UL-DL configuration refers to thefirst uplink reference UL-DL configuration for the serving cell(secondary cell).

For example, in a case that a first uplink reference UL-DL configuration0 is set to the other serving cell (primary cell) and a first uplinkreference UL-DL configuration 2 is set to the serving cell (secondarycell), a second uplink reference UL-DL configuration 1 is set to thesecondary cell.

In a case that the serving cell is the primary cell or the serving cellis the secondary cell and the terminal device 1 is not configured so asto monitor the PDCCH/EPDCCH with the CIF corresponding to the servingcell (secondary cell) in the other serving cell (primary cell), thefirst uplink reference UL-DL configuration for the serving cell is setto the second uplink reference UL-DL configuration for the serving cell(S1106).

The base station device 3 sets the second uplink reference UL-DLconfiguration on the basis of the setting method shown in FIG. 11.

The monitoring of the PDCCH/EPDCCH with the CIF means that the terminaldevice 1 tries to decode the PDCCH or the EPDCCH according to the DCIformat including the CIF. The CIF is a field to which a carrierindicator is mapped. The value of the carrier indicator indicates theserving cell corresponding to the DCI format related to the carrierindicator.

The terminal device 1 which is configured so as to monitor thePDCCH/EPDCCH with the CIF corresponding to the serving cell in the otherserving cell monitors the PDCCH/EPDCCH with the CIF in the other servingcell.

It is preferable that the terminal device 1 which is configured so as tomonitor the PDCCH/EPDCCH with the CIF corresponding to the serving cellin the other serving cell receive the third information on the servingcell through the PDCCH/EPDCCH in the other serving cell.

The terminal device 1 which is not configured so as to monitor thePDCCH/EPDCCH with the CIF corresponding to the serving cell in the otherserving cell monitors the PDCCH/EPDCCH with the CIF or the PDCCH/EPDCCHwithout the CIF in the serving cell.

It is preferable that the terminal device 1 which is not configured soas to monitor the PDCCH/EPDCCH with the CIF corresponding to the servingcell in the other serving cell receive the third information on theserving cell through the PDCCH/EPDCCH in the serving cell.

The PDCCH/EPDCCH for the primary cell is transmitted in the primarycell. It is preferable that the third information on the primary cell betransmitted through the PDCCH/EPDCCH of the primary cell.

The base station device 3 transmits, to the terminal device 1, aparameter (cif-Presence-r10) indicating whether or not the CIF isincluded in the DCI format transmitted in the primary cell.

The base station device 3 transmits, to the terminal device 1, aparameter (CrossCarrierSchedulingConfig-r10) related to cross carrierscheduling for each secondary cell.

The parameter (CrossCarrierSchedulingConfig-r10) includes a parameter(schedulingCellInfo-r10) indicating whether or not the PDCCH/EPDCCHcorresponding to a related secondary cell is transmitted in thesecondary cell or the other serving cell.

In a case that the parameter (schedulingCellInfo-r10) indicates that thePDCCH/EPDCCH corresponding to the related secondary cell is transmittedin the secondary cell, the parameter (shedulingCellInfo-r10) includesthe parameter (cif-Presence-r10) indicating whether or not the CIF isincluded in the DCI format transmitted in the secondary cell.

In a case that the parameter (schedulingCellInfo-r10) indicates that thePDCCH/EPDCCH corresponding to the related secondary cell is transmittedin the other serving cell, the parameter (schedulingCellInfo-r10)includes a parameter (schedulingCellId) indicating whether or not thedownlink allocation for the related secondary cell is transmitted in anyserving cell.

Next, a method for setting the second downlink reference UL-DLconfiguration will be described.

In a case that the plurality of serving cells are set to the terminaldevice 1 and the first downlink reference UL-DL configurations for atleast two serving cells are different from each other, the terminaldevice 1 and the base station device 3 set the second downlink referenceUL-DL configurations. The terminal device 1 and the base station device3 may not set the second downlink reference UL-DL configuration, excepta case that the plurality of serving cells are set to the terminaldevice 1 and the first downlink reference UL-DL configurations for atleast two serving cells are different from each other.

In some cases, the first downlink reference UL-DL configurations for allserving cells are the same, except a case that the first downlinkreference UL-DL configurations for at least two serving cells aredifferent from each other. In a case that one serving cell is set to theterminal device 1, the terminal device 1 and the base station device 3may not set the second downlink reference UL-DL configurations.

FIG. 13 is a flowchart illustrating a method for setting the seconddownlink reference UL-DL configuration in this embodiment. In FIG. 13,one primary cell and one secondary cell are set to the terminal device1. The terminal device 1 performs the setting method shown in FIG. 13for the primary cell and the secondary cell.

The terminal device 1 determines whether the first downlink referenceUL-DL configuration for the primary cell is different from the firstdownlink reference UL-DL configuration for the secondary cell (S1300).In a case that the first downlink reference UL-DL configuration for theprimary cell is the same as the first downlink reference UL-DLconfiguration for the secondary cell, the terminal device 1 does not setthe second downlink reference UL-DL configuration and ends the processof setting the second downlink reference UL-DL configuration.

In a case that the first downlink reference UL-DL configuration for theprimary cell is different from the first downlink reference UL-DLconfiguration for the secondary cell, the terminal device 1 determineswhether the serving cell is the primary cell or the secondary cell(S1302).

In a case that the serving cell is the secondary cell, the terminaldevice 1 sets the second uplink reference UL-DL configuration to theserving cell (secondary cell) on the basis of a pair which is formed bythe first downlink reference UL-DL configuration for the other servingcell (primary cell) and the first downlink reference UL-DL configurationfor the serving cell (secondary cell) (S1304).

In S1304, the terminal device 1 sets the second downlink reference UL-DLconfiguration for the serving cell (secondary cell) on the basis of thetable shown in FIG. 14. FIG. 14 is a diagram illustrating thecorrespondence between the pair which is formed by the first downlinkreference UL-DL configuration for the primary cell and the firstdownlink reference UL-DL configuration for the secondary cell and thesecond downlink reference UL-DL configuration for the secondary cell inthis embodiment.

In FIG. 14, the primary cell UL-DL configuration refers to the firstdownlink reference UL-DL configuration for the primary cell. In FIG. 14,the secondary cell UL-DL configuration refers to the first downlinkreference UL-DL configuration for the secondary cell.

In a case that the pair which is formed by the first downlink referenceUL-DL configuration for the primary cell and the first downlinkreference UL-DL configuration for the secondary cell belongs to a set 1in FIG. 14, the second downlink reference UL-DL configuration for thesecondary cell is defined in the set 1.

In a case that the terminal device 1 is not configured so as to monitorthe PDCCH/EPDCCH with the CIF corresponding to the secondary cell in theprimary cell and the pair which is formed by the first downlinkreference UL-DL configuration for the primary cell and the firstdownlink reference UL-DL configuration for the secondary cell belongs toa set 2 in FIG. 14, the second downlink reference UL-DL configurationfor the secondary cell is defined in the set 2.

In a case that the terminal device 1 is not configured so as to monitorthe PDCCH/EPDCCH with the CIF corresponding to the secondary cell in theprimary cell and the pair which is formed by the first downlinkreference UL-DL configuration for the primary cell and the firstdownlink reference UL-DL configuration for the secondary cell belongs toa set 3 in FIG. 14, the second downlink reference UL-DL configurationfor the secondary cell is defined in the set 3.

In a case that the terminal device 1 is configured so as to monitor thePDCCH/EPDCCH with the CIF corresponding to the secondary cell in theprimary cell and the pair which is formed by the first downlinkreference UL-DL configuration for the primary cell and the firstdownlink reference UL-DL configuration for the secondary cell belongs toa set 4 in FIG. 14, the second downlink reference UL-DL configurationfor the secondary cell is defined in the set 4.

In a case that the terminal device 1 is configured so as to monitor thePDCCH/EPDCCH with the CIF corresponding to the secondary cell in theprimary cell and the pair which is formed by the first downlinkreference UL-DL configuration for the primary cell and the firstdownlink reference UL-DL configuration for the secondary cell belongs toa set 5 in FIG. 14, the second downlink reference UL-DL configurationfor the secondary cell is defined in the set 5.

For example, in a case that first downlink reference UL-DL configuration1 is set to the primary cell and a first downlink reference UL-DLconfiguration 0 is set to the secondary cell, a second downlinkreference UL-DL configuration 1 is set to the secondary cell.

When the serving cell is the primary cell, the first downlink referenceUL-DL configuration for the serving cell (primary cell) is set to thesecond downlink reference UL-DL configuration for the serving cell(primary cell) (S1306).

The base station device 3 also sets the second downlink reference UL-DLconfiguration on the basis of the setting method shown in FIG. 13.

Next, the first uplink reference UL-DL configuration will be described.

The first uplink reference UL-DL configuration is at least used tospecify the subframe which is capable or incapable of performing uplinktransmission in the serving cell.

The terminal device 1 does not perform uplink transmission in thesubframe which is indicated as the downlink subframe by the first uplinkreference UL-DL configuration. The terminal device 1 does not performuplink transmission in the DwPTS and GP of the subframe which isindicated as the special subframe by the first uplink reference UL-DLconfiguration.

Next, the first downlink reference UL-DL configuration will bedescribed.

The first downlink reference UL-DL configuration is at least used tospecify the subframe which is capable or incapable of performingdownlink transmission in the serving cell.

The terminal device 1 does not perform downlink transmission in thesubframe which is indicated as the uplink subframe by the first downlinkreference UL-DL configuration. The terminal device 1 does not performdownlink transmission in the UpPTS and GP of the subframe which isindicated as the special subframe by the first downlink reference UL-DLconfiguration.

The terminal device 1 which sets the first downlink reference UL-DLconfiguration on the basis of the first information may performmeasurement using the downlink signal (for example, the measurement ofthe channel state information) in the DwPTS of the special subframe orthe downlink subframe which is indicated by the first uplink referenceUL-DL configuration or the first downlink reference UL-DL configuration.

The base station device 3 determines the downlink reference UL-DLconfiguration from a configuration set (the setting of the set) which islimited on the basis of the first uplink reference UL-DL configuration.That is, the first downlink reference UL-DL configuration is an elementin the configuration set which is limited on the basis of the firstuplink reference UL-DL configuration. The configuration set which islimited on the basis of the first uplink reference UL-DL configurationincludes uplink-downlink configurations satisfying the followingconditions (a) to (c). FIG. 15 is a diagram illustrating therelationship between the subframe indicated by the first uplinkreference UL-DL configuration and the subframe indicated by the firstdownlink reference UL-DL configuration in this embodiment. In FIG. 15, Dindicates the downlink subframe, U indicates the uplink subframe, and Sindicates the special subframe.

Condition (a): the subframe which is indicated as the downlink subframeby the first uplink reference UL-DL configuration is indicated as thedownlink subframe.

Condition (b): the subframe which is indicated as the uplink subframe bythe first uplink reference UL-DL configuration is indicated as theuplink subframe or the downlink subframe.

Condition (c): the subframe which is indicated as the special subframeby the first uplink reference UL-DL configuration is indicated as thedownlink subframe or the special subframe.

Therefore, in the dynamic TDD, since the subframe which is indicated asthe downlink subframe by the first uplink reference UL-DL configurationand the DwPTS of the special subframe are not used for uplinktransmission, the terminal device 1 which sets the first downlinkreference UL-DL configuration on the basis of the first information canappropriately perform measurement using the downlink signal.

In addition, the terminal device 1 which sets the first downlinkreference UL-DL configuration on the basis of the second information mayperform measurement (for example, the measurement of the channel stateinformation) using the downlink signal in the DwPTS of the specialsubframe or the downlink subframe which is indicated by the first uplinkreference UL-DL configuration.

The subframe which is indicated as the uplink subframe by the firstuplink reference UL-DL configuration and is indicated as the downlinksubframe by the first downlink reference UL-DL configuration is alsoreferred to as a first flexible subframe. The first flexible subframe isa subframe which is reserved for uplink and downlink transmission.

The subframe which is indicated as the special subframe by the firstuplink reference UL-DL configuration and is indicated as the downlinksubframe by the first downlink reference UL-DL configuration is alsoreferred to as a second flexible subframe. The second flexible subframeis a subframe which is reserved for downlink transmission. The secondflexible subframe is a subframe which is reserved for downlinktransmission in the DwPTS and uplink transmission in the UpPTS.

Next, the transmission direction UL-DL configuration will be describedin detail.

The terminal device 1 and the base station device 3 set the transmissiondirection UL-DL configuration for the transmission direction(downward/upward) in the subframe. The transmission direction UL-DLconfiguration is used to determine the transmission direction in thesubframe.

The terminal device 1 controls transmission in the first flexiblesubframe and the second flexible subframe, on the basis of thescheduling information (the DCI format and/or the HARQ-ACK) and thetransmission direction UL-DL configuration.

The base station device 3 transmits the third information indicating thetransmission direction UL-DL configuration to the terminal device 1. Thethird information is information indicating the subframe which canperform uplink transmission. The third information is informationindicating the subframe which can perform downlink transmission. Thethird information is information indicating the subframe which canperform uplink transmission in the UpPTS and can perform downlinktransmission in the DwPTS.

For example, the transmission direction UL-DL configuration is used tospecify the transmission direction in the subframe which is indicated asthe uplink subframe by the first uplink reference UL-DL configurationand is indicated as the downlink subframe by the first downlinkreference UL-DL configuration and/or the subframe which is indicated asthe special subframe by the first uplink reference UL-DL configurationand is indicated as the downlink subframe by the first downlinkreference UL-DL configuration. That is, the transmission direction UL-DLconfiguration is used to specify the transmission direction in thesubframes which are indicated as different subframes by the first uplinkreference UL-DL configuration and the first downlink reference UL-DLconfiguration.

FIG. 16 is a diagram illustrating the relationship between the subframewhich is indicated by the first uplink reference UL-DL configuration,the subframe which is indicated by the first downlink reference UL-DLconfiguration, and the subframe which is indicated by the transmissiondirection UL-DL configuration in this embodiment. In FIG. 16, Dindicates the downlink subframe, U indicates the uplink subframe, and Sindicates the special subframe.

The base station device 3 determines the transmission direction UL-DLconfiguration from a configuration set (the setting of the set) which islimited on the basis of the first uplink reference UL-DL configurationand the first downlink reference UL-DL configuration. That is, thetransmission direction UL-DL configuration is an element in theconfiguration set which is limited on the basis of the first uplinkreference UL-DL configuration and the first downlink reference UL-DLconfiguration. The configuration set which is limited on the basis ofthe first uplink reference UL-DL configuration and the first downlinkreference UL-DL configuration includes uplink-downlink configurationssatisfying the following conditions (d) to (h).

Condition (d): the subframe which is indicated as the downlink subframeby the first uplink reference UL-DL configuration and the first downlinkreference UL-DL configuration is indicated as the downlink subframe.

Condition (e): the subframe which is indicated as the uplink subframe bythe first uplink reference UL-DL configuration and the first downlinkreference UL-DL configuration is indicated as the uplink subframe.

Condition (f): the subframe which is indicated as the uplink subframe bythe first uplink reference UL-DL configuration and is indicated as thedownlink subframe by the first downlink reference UL-DL configuration isindicated as the uplink subframe or the downlink subframe.

Condition (g): the subframe which is indicated as the special subframeby the first uplink reference UL-DL configuration and the first downlinkreference UL-DL configuration is indicated as the special subframe.

Condition (h): the subframe which is indicated as the special subframeby the first uplink reference UL-DL configuration and is indicated asthe downlink subframe by the first downlink reference UL-DLconfiguration is indicated as the special subframe or the downlinksubframe.

The base station device 3 may schedule downlink transmission in thesubframe which is indicated as the downlink subframe by the transmissiondirection UL-DL configuration.

The terminal device 1 may performs a downlink signal receiving processin the subframe which is indicated as the downlink subframe by thetransmission direction UL-DL configuration. The terminal device 1 maymonitor the PDCCH/EPDCCH in the subframe which is indicated as thedownlink subframe by the transmission direction UL-DL configuration. Theterminal device 1 may perform a PDSCH receiving process in the subframewhich is indicated as the downlink subframe by the transmissiondirection UL-DL configuration, on the basis of the detection of thedownlink grant through the PDCCH/EPDCCH.

In a case that the transmission of the uplink signal (PUSCH/SRS) in thesubframe which is indicated as the downlink subframe by the transmissiondirection UL-DL configuration is scheduled or set, the terminal device 1may not perform an uplink signal (PUSCH/SRS) transmitting process in thesubframe.

The base station device 3 may schedule uplink transmission in thesubframe which is indicated as the uplink subframe by the transmissiondirection UL-DL configuration.

The base station device 3 may schedule downlink transmission in thesubframe which is indicated as the uplink subframe by the transmissiondirection UL-DL configuration. The scheduling of the downlinktransmission by the base station device 3 may be prohibited in thesubframe which is indicated as the uplink subframe by the transmissiondirection UL-DL configuration.

The terminal device 1 may perform an uplink signal transmitting processin the subframe which is indicated as the uplink subframe by thetransmission direction UL-DL configuration. In a case that thetransmission of the uplink signal (PUSCH/DMRS/SRS) in the subframe whichis indicated as the uplink subframe by the transmission direction UL-DLconfiguration is scheduled or set, the terminal device 1 may perform theuplink signal (PUSCH/DMRS/SRS) transmitting process in the subframe.

The terminal device 1 may perform the downlink signal receiving processin the subframe which is indicated as the uplink subframe by thetransmission direction UL-DL configuration and in which uplinktransmission is not scheduled. The downlink signal receiving process ofthe terminal device 1 may be prohibited in the subframe which isindicated as the uplink subframe by the transmission direction UL-DLconfiguration.

The base station device 3 may schedule downlink transmission in theDwPTS of the subframe which is indicated as the special subframe by thetransmission direction UL-DL configuration.

The terminal device 1 may perform the downlink signal receiving processin the DwPTS of the subframe which is indicated as the special subframeby the transmission direction UL-DL configuration. The terminal device 1may monitor the PDCCH/EPDCCH in the DwPTS of the subframe which isindicated as the special subframe by the transmission direction UL-DLconfiguration. The terminal device 1 may perform the PDSCH receivingprocess in the DwPTS of the subframe which is indicated as the specialsubframe by the transmission direction UL-DL configuration, on the basisof the detection of the downlink grant through the PDCCH/EPDCCH.

In a case that the transmission of the PUSCH in the subframe which isindicated as the special subframe by the transmission direction UL-DLconfiguration is scheduled or set, the terminal device 1 does notperform a PUSCH transmitting process in the subframe.

In a case that the transmission of the SRS in the UpPTS of the subframewhich is indicated as the special subframe by the transmission directionUL-DL configuration is scheduled or set, the terminal device 1 mayperform an SRS transmitting process in the UpPTS of the subframe.

In the first flexible subframe indicated as the downlink subframe by thetransmission direction UL-DL configuration, the CRS, PDCCH, PHICH,and/or PCFICH may not be transmitted. In this case, in the firstflexible subframe used as the downlink subframe, the EPDCCH and PDSCHare transmitted.

In the first flexible subframe indicated as the downlink subframe by thetransmission direction UL-DL configuration, the base station device 3may control whether to transmit the CRS, PDCCH, PHICH, and/or PCFICH. Inthis case, the base station device 3 transmits a CRS parameterindicating whether or not CRS, PDCCH, PHICH and/or PCFICH is transmittedin the first flexible subframe indicated as the downlink subframe by thetransmission direction UL-DL configuration to the terminal device 1, andthe terminal device 1 sets the CRS parameter.

In the GP and UpPTS fields of the second flexible subframe indicated asthe downlink subframe by the transmission direction UL-DL configuration,the CRS may not be transmitted. In the second flexible subframeindicated as the downlink subframe by the transmission direction UL-DLconfiguration, the base station device 3 may control whether or not totransmit the CRS. In this case, the terminal device 1 may determinewhether or not the CRS is transmitted in the GP and UpPTS fields of thesecond flexible subframe indicated as the downlink subframe by thetransmission direction UL-DL configuration on the basis of the CRSparameter.

FIG. 17 is a diagram illustrating the relationship between the firstuplink reference UL-DL configuration, the first downlink reference UL-DLconfiguration, and the transmission direction UL-DL configuration inthis embodiment.

For example, in FIG. 17, in a case that the first uplink reference UL-DLconfiguration is 0, the first downlink reference UL-DL configuration isone of a set {0, 1, 2, 3, 4, 5, 6}. For example, in FIG. 17, in a casethat the first uplink reference UL-DL configuration is 1, the firstdownlink reference UL-DL configuration is one of a set {1, 2, 4, 5}.

For example, in FIG. 17, in a case that the first uplink reference UL-DLconfiguration is 0 and the first downlink reference UL-DL configurationis 1, the transmission direction UL-DL configuration is one of a set {0,1, 6}.

The value of the first downlink reference UL-DL configuration may beequal to the value of the first uplink reference UL-DL configuration.However, the terminal device 1 which does not receive the secondinformation sets the same value as the value of the first uplinkreference UL-DL configuration to the first downlink reference UL-DLconfiguration. Therefore, preferably, the value of the first downlinkreference UL-DL configuration indicated by the second information is notequal to the value of the first uplink reference UL-DL configurationindicated by the first information.

In a case that the value of the first uplink reference UL-DLconfiguration is equal to the value of the first downlink referenceUL-DL configuration, the transmission direction UL-DL configuration maynot be defined. Alternatively, in a case that the value of the firstuplink reference UL-DL configuration is equal to the value of the firstdownlink reference UL-DL configuration, the same value as the value ofthe first uplink reference UL-DL configuration and the value of thefirst downlink reference UL-DL configuration may be set to thetransmission direction UL-DL configuration.

The third information may be information indicating the transmissiondirection UL-DL configuration in the configuration set (the setting ofthe set) including the first uplink reference UL-DL configuration andthe first downlink reference UL-DL configuration.

Next, the first uplink reference UL-DL configuration and the seconduplink reference UL-DL configuration will be described in detail.

The first uplink reference UL-DL configuration and the second uplinkreference UL-DL configuration are used to specify (select or determine)the correspondence between the subframe n in which a PDCCH/EPDCCH/PHICHis arranged and the subframe n+k in which a PUSCH corresponding to thePDCCH/EPDCCH/PHICH is arranged.

In a case that one primary cell is set or in a case that one primarycell and one secondary cell are set and the first uplink reference UL-DLconfiguration for the primary cell is the same as the first uplinkreference UL-DL configuration for the secondary cell, the correspondingfirst uplink reference UL-DL configuration is used to determine thecorrespondence between a subframe in which a PDCCH/EPDCCH/PHICH isarranged and a subframe in which a PUSCH corresponding to thePDCCH/EPDCCH/PHICH is arranged, in each of the two serving cells.

In a case that one primary cell and one secondary cell are set and thefirst uplink reference UL-DL configuration for the primary cell isdifferent from the first uplink reference UL-DL configuration for thesecondary cell, the corresponding second uplink reference UL-DLconfiguration is used to determine the correspondence between a subframein which a PDCCH/EPDCCH/PHICH is arranged and a subframe in which aPUSCH corresponding to the PDCCH/EPDCCH/PHICH is arranged, in each ofthe two serving cells.

FIG. 18 is a diagram illustrating the correspondence between a subframen in which a PDCCH/EPDCCH/PHICH is arranged and a subframe n+k in whicha PUSCH corresponding to the PDCCH/EPDCCH/PHICH is arranged in thisembodiment. The terminal device 1 specifies (selects or determines) thevalue of k according to the table shown in FIG. 18.

In FIG. 18, in a case that one primary cell is set or in a case that oneprimary cell and one secondary cell are set and the first uplinkreference UL-DL configuration for the primary cell is the same as thefirst uplink reference UL-DL configuration for the secondary cell, theuplink-downlink configuration refers to the first uplink reference UL-DLconfiguration.

In FIG. 18, in a case that one primary cell and one secondary cell areset and the first uplink reference UL-DL configuration for the primarycell is different from the first uplink reference UL-DL configurationfor the secondary cell, the uplink-downlink configuration refers to thesecond uplink reference UL-DL configuration.

Hereinafter, in the description of FIG. 18, the first uplink referenceUL-DL configuration and the second uplink reference UL-DL configurationare simply referred to as an uplink-downlink configuration.

In a case that the PDCCH/EPDCCH with the uplink grant, which correspondsto the serving cells to which uplink-downlink configurations 1 to 6 areset and is for the terminal device 1, is detected in the subframe n, theterminal device 1 performs PUSCH transmission corresponding to theuplink grant in the subframe n+k which is specified (selected ordetermined) on the basis of the table shown in FIG. 18.

In a case that the PHICH with the NACK, which corresponds to the servingcells to which the uplink-downlink configurations 1 to 6 are set and isfor the terminal device 1, is detected in the subframe n, the terminaldevice 1 performs PUSCH transmission in the subframe n+k which isspecified (selected or determined) on the basis of the table shown inFIG. 18.

The uplink grant, which corresponds to the serving cell to which theuplink-downlink configuration 0 is set and is for the terminal device 1,includes a 2-bit uplink index (UL index). The uplink grant, whichcorresponds to the serving cells to which the uplink-downlinkconfigurations 1 to 6 are set and is for the terminal device 1, does notinclude the uplink index (UL index).

In a case that the most significant bit (MSB) of the uplink indexincluded in the uplink grant corresponding to the serving cell to whichthe uplink-downlink configuration 0 is set is set to 1 in the subframen, the terminal device 1 adjusts PUSCH transmission corresponding to theuplink grant in the subframe n+k which is specified (selected ordetermined) on the basis of the table shown in FIG. 18.

In a case that the PHICH with the NACK corresponding to the serving cellto which the uplink-downlink configuration 0 is set is received in afirst resource set of the subframe n=0 or 5, the terminal device 1adjusts PUSCH transmission corresponding to the PHICH in the subframen+k which is specified (selected or determined) on the basis of thetable shown in FIG. 18.

In a case that the least significant bit (LSB) of the uplink indexincluded in the uplink grant corresponding to the serving cell to whichthe uplink-downlink configuration 0 is set is set to 1 in the subframen, the terminal device 1 adjusts PUSCH transmission corresponding to theuplink grant in a subframe n+7.

In a case that the PHICH with the NACK corresponding to the serving cellto which the uplink-downlink configuration 0 is set is received in asecond resource set of the subframe n=0 or 5, the terminal device 1adjusts PUSCH transmission corresponding to the uplink grant in thesubframe n+7.

In a case that the PHICH with the NACK corresponding to the serving cellto which the uplink-downlink configuration 0 is set is received in thesubframe n=1 or 6, the terminal device 1, the terminal device 1 adjustsPUSCH transmission corresponding to the uplink grant in the subframen+7.

For example, in a case that the PDCCH/EPDCCH/PHICH corresponding to theserving cell to which the uplink-downlink configuration 0 is set isdetected in [SFN=m, subframe 1], the terminal device 1 adjusts PUSCHtransmission in [SFN=m, subframe 7] which is six subframes after thesubframe 1.

The first uplink reference UL-DL configuration and the second uplinkreference UL-DL configuration are used to specify (select or determine)the correspondence between the subframe n in which a PHICH is arrangedand the subframe n−k in which a PUSCH corresponding to the PHICH isarranged.

In a case that one primary cell is set or in a case that one primarycell and one secondary cell are set and the first uplink reference UL-DLconfiguration for the primary cell is the same as the first uplinkreference UL-DL configuration for the secondary cell, the correspondingfirst uplink reference UL-DL configuration is used to specify (select ordetermine) the correspondence between the subframe n in which a PHICH isarranged and the subframe n−k in which a PUSCH corresponding to thePHICH is arranged, in each of the two serving cells.

In a case that one primary cell and one secondary cell are set and thefirst uplink reference UL-DL configuration for the primary cell isdifferent from the first uplink reference UL-DL configuration for thesecondary cell, the corresponding second uplink reference UL-DLconfiguration is used to specify (select or determine) thecorrespondence between the subframe n in which a PHICH is arranged andthe subframe n−k in which a PUSCH corresponding to the PHICH isarranged, in each of the two serving cells.

FIG. 19 is a diagram illustrating the correspondence between thesubframe n in which a PHICH is arranged and the subframe n−k in which aPUSCH corresponding to the PHICH is arranged in this embodiment. Theterminal device 1 specifies (selects or determines) the value of kaccording to the table shown in FIG. 19.

In FIG. 19, in a case that one primary cell is set or in a case that oneprimary cell and one secondary cell are set and the first uplinkreference UL-DL configuration for the primary cell is the same as thefirst uplink reference UL-DL configuration for the secondary cell, theuplink-downlink configuration refers to the first uplink reference UL-DLconfiguration.

In FIG. 19, in a case that one primary cell and one secondary cell areset and the first uplink reference UL-DL configuration for the primarycell is different from the first uplink reference UL-DL configurationfor the secondary cell, the uplink-downlink configuration refers to thesecond uplink reference UL-DL configuration.

Hereinafter, in the description of FIG. 19, the first uplink referenceUL-DL configuration and the second uplink reference UL-DL configurationare simply referred to as an uplink-downlink configuration.

The HARQ indicator (HARQ-ACK), which is received through the PHICHcorresponding to the serving cells to which the uplink-downlinkconfigurations 1 to 6 are set in the subframe n, is related to thetransmission of the PUSCH in the subframe n−k that is specified on thebasis of the table shown in FIG. 19.

The HARQ indicator (HARQ-ACK), which is received through the PHICHcorresponding to the serving cell to which the uplink-downlinkconfiguration 0 is set in the first resource set of the subframe n=0 or5 or the subframe n=1 or 6, is related to the transmission of the PUSCHin the subframe n−k that is specified on the basis of the table shown inFIG. 19.

The HARQ indicator (HARQ-ACK), which is received through the PHICHcorresponding to the serving cell to which the uplink-downlinkconfiguration 0 is set in the second resource set of the subframe n=0 or5, is related to the transmission of the PUSCH in the subframe n−6.

For example, the HARQ indicator (HARQ-ACK), which is received throughthe PHICH corresponding to the serving cell to which the uplink-downlinkconfiguration 1 is set in the [SFN=m, subframe 1], is related to thetransmission of the PUSCH in [SFN=m−1, subframe 7] that is foursubframes before the subframe 1.

The first uplink reference UL-DL configuration and the second uplinkreference UL-DL configuration are used to specify (select or determine)the correspondence between the subframe n in which a PUSCH is arrangedand the subframe n+k in which a PHICH corresponding to the PUSCH isarranged.

In a case that one primary cell is set or in a case that one primarycell and one secondary cell are set and the first uplink reference UL-DLconfiguration for the primary cell is the same as the first uplinkreference UL-DL configuration for the secondary cell, the correspondingfirst uplink reference UL-DL configuration is used to specify (select ordetermine) the correspondence between the subframe n in which a PUSCH isarranged and the subframe n+k in which a PHICH corresponding to thePUSCH is arranged, in each of the two serving cells.

In a case that one primary cell and one secondary cell are set and thefirst uplink reference UL-DL configuration for the primary cell isdifferent from the first uplink reference UL-DL configuration for thesecondary cell, the corresponding second uplink reference UL-DLconfiguration is used to specify (select or determine) thecorrespondence between the subframe n in which a PUSCH is arranged andthe subframe n+k in which a PHICH corresponding to the PUSCH isarranged, in each of the two serving cells.

FIG. 20 is a diagram illustrating the correspondence between thesubframe n in which a PUSCH is arranged and the subframe n+k in which aPHICH corresponding to the PUSCH is arranged in this embodiment. Theterminal device 1 specifies (selects or determines) the value of kaccording to the table shown in FIG. 20.

In FIG. 20, in a case that one primary cell is set or in a case that oneprimary cell and one secondary cell are set and the first uplinkreference UL-DL configuration for the primary cell is the same as thefirst uplink reference UL-DL configuration for the secondary cell, theuplink-downlink configuration refers to the first uplink reference UL-DLconfiguration.

In FIG. 20, in a case that one primary cell and one secondary cell areset and the first uplink reference UL-DL configuration for the primarycell is different from the first uplink reference UL-DL configurationfor the secondary cell, the uplink-downlink configuration refers to thesecond uplink reference UL-DL configuration.

Hereinafter, in the description of FIG. 20, the first uplink referenceUL-DL configuration and the second uplink reference UL-DL configurationare simply referred to as an uplink-downlink configuration.

In a case that the transmission of the PUSCH is scheduled in thesubframe n, the terminal device 1 determines a PHICH resource in thesubframe n+k that is specified on the basis of the table shown in FIG.20.

For example, in a case that the transmission of the PUSCH correspondingto the serving cell to which the uplink-downlink configuration 0 is setis scheduled in [SFN=m, subframe n=2], the PHICH resource is determinedin [SFN=m, subframe n=6].

Next, the first downlink reference UL-DL configuration and the seconddownlink reference UL-DL configuration will be described in detail.

The first downlink reference UL-DL configuration and the second downlinkreference UL-DL configuration are used to specify (select or determine)the correspondence between the subframe n in which a PDSCH is arrangedand the subframe n+k in which an HARQ-ACK corresponding to the PDSCH istransmitted.

In a case that one primary cell is set or in a case that one primarycell and one secondary cell are set and the first downlink referenceUL-DL configuration for the primary cell is the same as the firstdownlink reference UL-DL configuration for the secondary cell, thecorresponding first downlink reference UL-DL configuration is used tospecify (select or determine) the correspondence between the subframe nin which a PDSCH is arranged and the subframe n+k in which a HARQ-ACKcorresponding to the PDSCH is transmitted, in each of the two servingcells.

In a case that one primary cell and one secondary cell are set and thefirst uplink reference UL-DL configuration for the primary cell and thefirst downlink reference UL-DL configuration for the secondary cell aredifferent, the corresponding second downlink reference UL-DLconfiguration is used to specify (select or determine) of thecorrespondence between the subframe n in which a PDSCH is arranged andthe subframe n+k in which a HARQ-ACK corresponding to the PDSCH istransmitted in each of the two serving cells.

FIG. 21 is a diagram illustrating the correspondence between thesubframe n−k in which a PDSCH is arranged and the subframe n in which anHARQ-ACK corresponding to the PDSCH is transmitted in this embodiment.The terminal device 1 specifies (selects or determines) the value of kaccording to the table shown in FIG. 21.

In FIG. 21, in a case that one primary cell is set or in a case that oneprimary cell and one secondary cell are set and the first downlinkreference UL-DL configuration for the primary cell is the same as thefirst downlink reference UL-DL configuration for the secondary cell, theuplink-downlink configuration refers to the first downlink referenceUL-DL configuration.

In FIG. 21, in a case that one primary cell and one secondary cell areset and the first downlink reference UL-DL configuration for the primarycell is different from the first downlink reference UL-DL configurationfor the secondary cell, the uplink-downlink configuration refers to thesecond downlink reference UL-DL configuration.

Hereinafter, in the description of FIG. 21, the first downlink referenceUL-DL configuration and the second downlink reference UL-DLconfiguration are simply referred to as an uplink-downlinkconfiguration.

In a case that the transmission of the PDSCH which transmits thecorresponding HARQ-ACK and is for the terminal device 1 in the subframen−k (k is specified by the table shown in FIG. 21) of the serving cellis detected, the terminal device 1 transmits the HARQ-ACK in thesubframe n.

For example, the terminal device 1 does not perform the response of theHARQ-ACK for the transmission of the PDSCH used to transmit the systeminformation. For example, the terminal device 1 performs the response ofthe HARQ-ACK for the transmission of the PDSCH scheduled by the DCIformat with the CRC scrambled with the C-RNTI.

For example, the terminal device 1 transmits the HARQ-ACK for the PDSCHreceived in the subframe n−6 and/or n−7 in the serving cell to which theuplink-downlink configuration 1 is set in the subframe n=2.

The first downlink reference UL-DL configuration may not be set to theserving cell which does not receive the second information. In thiscase, the terminal device 1 and the base station device 3 may performthe process based on the first downlink reference UL-DL configuration,on the basis of the first uplink reference UL-DL configuration (servingcell UL-DL configuration). The serving cell which does not receive thesecond information is a serving cell to which the dynamic TDD is notset.

For example, in a case that one primary cell and one secondary cell areset, the second information on the primary cell is not received, thesecond information on the secondary cell is received, the first uplinkreference UL-DL configuration (serving cell UL-DL configuration) for theprimary cell is different from the first downlink reference UL-DLconfiguration for the secondary cell, and the serving cell is thesecondary cell, the second downlink reference UL-DL configuration forthe serving cell (secondary cell) may be set on the basis of a pairwhich is formed by the first uplink reference UL-DL configuration forthe other serving cell (primary cell) and the first downlink referenceUL-DL configuration for the serving cell (secondary cell).

For example, in a case that one primary cell and one secondary cell areset, the second information on the primary cell is not received, thesecond information on the secondary cell is received, and the firstuplink reference UL-DL configuration (serving cell UL-DL configuration)for the primary cell is different from the first downlink referenceUL-DL configuration for the secondary cell, the corresponding seconddownlink reference UL-DL configuration may be used to specify (select ordetermine) the correspondence between the subframe n in which a PDSCH isarranged and the subframe n+k in which an HARQ-ACK corresponding to thePDSCH is transmitted, in each of the two serving cells.

For example, in a case that one primary cell and one secondary cell areset, the second information on the primary cell is not received, thesecond information on the secondary cell is received, and the firstuplink reference UL-DL configuration (serving cell UL-DL configuration)for the primary cell is the same as the first downlink reference UL-DLconfiguration for the secondary cell, the corresponding first uplinkreference UL-DL configuration (serving cell UL-DL configuration) may beused to specify (select or determine) the correspondence between thesubframe n in which a PDSCH is arranged and the subframe n+k in which aHARQ-ACK corresponding to the PDSCH is transmitted in the primary celland the corresponding first downlink reference UL-DL configuration maybe used to specify (select or determine) the correspondence between thesubframe n in which a PDSCH is arranged and the subframe n+k in which anHARQ-ACK corresponding to the PDSCH is transmitted in the secondarycell.

For example, in a case that one primary cell and one secondary cell areset, the second information on the primary cell is not received, thesecond information on the secondary cell is received, and the firstuplink reference UL-DL configuration (serving cell UL-DL configuration)for the primary cell is different from the first downlink referenceUL-DL configuration for the secondary cell, the primary cell UL-DLconfiguration refers to the first uplink reference UL-DL configurationfor the primary cell, in FIGS. 12 and 14.

Hereinafter, the CSI will be described in detail.

The CSI includes a channel quality indicator (CQI), a rank indicator(RI), and a precoding matrix indicator (PMI). The CQI represents acombination of a modulation method and a coding rate for a singletransport block transmitted on the PDSCH. The coding rate is derivedfrom a PDSCH resource amount and a transport block size.

FIG. 22 is a table representing a coding rate and a modulation methodcorresponding to the CQI index in this embodiment. The terminal device 1derives a highest CQI index from 1 to 15 of the table shown in FIG. 22which satisfies a condition where a single PDSCH transport block whichis transmitted in a group of downlink physical resource blocks calledCSI reference resources and is a combination of a transport block sizeand a modulation method corresponding to a CQI index may be receivedwith a transport block error probability of equal to or less than 0.1.In a case that a CQI index 1 does not satisfy the aforementionedcondition, the terminal device 1 derives a CQI index 0.

However, in a case that the UL-DL configurations of the adjacent celland the serving cell are different, interference states are differentfor each subframe. In this embodiment, at least two subframe sets aredefined, and the terminal device 1 reports the channel state informationfor each of at least two subframe sets to the base station device 3. Thesubframe set is preferably configured based on the interference state ofthe subframe.

FIG. 23 is a diagram illustrating an example of the structure of thesubframe set in this embodiment. In FIG. 23, D indicates a downlinksubframe, U indicates an uplink subframe, S indicates a specialsubframe, a indicates a subframe belonging to a first subframe set, bindicates a subframe belonging to a second subframe set, and F indicatesa first flexible subframe.

In FIG. 23, the downlink transmission is performed in subframes {0, 1,3, 4, 5, 6, 8, 9} of the serving cell. In FIG. 23, the downlinktransmission is performed in subframes {0, 1, 5, 6, 9} of the adjacentcell, and the uplink transmission is performed in subframes {3, 4, 8} ofthe adjacent cell. Accordingly, in the serving cell, an interferencestate is different between the subframes {0, 1, 5, 6, 9} and thesubframes {3, 4, 8}. In FIG. 23, the first subframe set includes thesubframes {0, 1, 5, 6, 9}, and the second subframe set includes thesubframes {3, 4, 8}.

The base station device 3 may transmit information indicating thesubframe set to the terminal device 1, and the terminal device 1 may setthe subframe set on the basis of the information.

The subframe set may be implicitly configured based on the firstflexible subframe. For example, the first subframe set may include thefirst flexible subframe, and the second subframe set may include thesubframe indicated as the downlink subframe or the special subframe bythe first uplink reference UL-DL configuration.

Multiple CSI processes may be configured to the terminal device 1. Atleast two subframe sets may be configured for a single CSI process. Atleast two CSI processes may be configured to the terminal device 1, andone subframe set may be configured for each of at least two CSIprocesses.

The terminal device 1 may derive the CSI for each of the multiple CSIprocesses and/or each of the plurality of subframe sets, and may reportthe CSI. [0321]

The special subframe including a DwPTS having a length equal to orshorter than 7680/(15000×2048) seconds may not belong to any subframeset.

The report of the CSI is periodic, or aperiodic. A CSI that isperiodically reported is referred to as a periodic CSI. A CSI that isaperidocally reported is referred to as an aperiodic CSI.

A resource used to report the CSI by the terminal device 1 is controlledby the base station device 3.

The terminal device 1 is semi-statically configured by the higher layer(RRC layer) such that the CSI is periodically fed back through thePUCCH. That is, the terminal device 1 set a subframe that reports theperiodic CSI by the higher layer (RRC layer). The terminal device 1 mayset the periodic CSI report for each CSI process and/or each subframeset.

The aperiodic CSI is transmitted on the PUSCH. The terminal device 1detects the uplink grant in the subframe n for the serving cell c, andreports the aperiodic CSI by using the PUSCH scheduled by the uplinkgrant in the subframe n+k of the serving cell c in a case that the CSIrequest field included in the uplink grant is set to trigger the CSIreport.

Information (CSI request) indicating whether to instruct the terminaldevice 1 to report the aperiodic CSI is mapped to the CSI request field.The information indicates the CSI process and/or the subframe set, andthe terminal device 1 may report the aperiodic CSI for each CSI processand/or each subframe set indicated by the information.

The terminal device 1 derives a wide band CQI and a sub band CQI. In thefrequency domain, the wide band CQI corresponds to all of the downlinkphysical resource blocks, and the sub band CQI corresponds to some ofdownlink physical resource blocks.

Hereinafter, the CSI reference resource will be described.

In the frequency domain, the CSI reference resource is defined by agroup of downlink physical resource blocks corresponding to a band towhich a value of the derived CQI is related.

In the time domain, the CSI reference resource is defined by onesubframe. In a case that the CSI is reported in the subframe n, the CSIreference resource is defined by the subframe n−nCQIref.

For example, in a case that the CSI is reported in the subframe n,nCQIref is a smallest value that is equal to or greater than m such thatthe subframe n−nCQIref corresponds to a valid subframe. For example, mis 4 or 5. For example, in a case that the aperiodic CSI is reported,the CSI reference resource is a valid subframe that receives thecorresponding CSI request.

FIG. 24 illustrates an example of the subframe set. The subframe setincludes, for example, at least two subframe set from the higher layer.In FIG. 24, the subframes {0, 1, 5, 6} are included in the subframe set0, the subframes {3, 4, 7, 8, 9} are included in the subframe set 1. Ofcourse, the number of subframes or included subframe number may bearbitrarily configured by information of the higher layer.

FIG. 25 illustrates an example of the CSI corresponding to the bitincluded in the CSI request filed. The bits “00” represents that the CSIreport is not requested, and “01”, “10” and “11” are set such that theCSI report corresponding to the CSIs of the first and/or the secondsubframe sets is triggered. For example, a value of the CSI requestfield being “01” means that the aperiodic CSI report corresponding tothe CIS of the first subframe set is triggered, a value of the CSIrequest field being “10” means that the aperiodic CSI reportcorresponding to the CIS of the second subframe set is triggered, andthe value of the CSI request field being “11” means that the aperiodicCSI report of the CSIs corresponding to both of the first and secondsubframe sets are triggered.

FIG. 26 shows an example of configuration of the correspondence betweenthe bit value of the CSI request field and the subframe set by thehigher layer. In this drawing, the first subframe set is configured as asubframe set #0, and the second subframe set is configured as a subframeset #1. The base station device 3 configures by using information of thehigher layer (for example, the RRC layer), to the terminal device 1, thecorrespondence between the value of the CSI request field and thesubframe set. The terminal device 1 performs the CSI report which istriggered based on the value of the CSI request field indicated usingthe control information (for example, DCI) and is for one correspondingsubframe set or a plurality of corresponding subframe sets. That is, theterminal device 1 performs the CSI report for the one or plurality ofsubframe sets on the basis of the correspondence between the value ofthe CSI request field and the subframe set which is configured by thehigher layer and the value of the CSI request field included in thecontrol information (for example, DCI).

Similarly, for example, in a case that three subframe sets areconfigured, the CSI report of a set of the subframe sets is triggered bythe value of the CSI request field.

For example, in a case that the correspondence between the value of theCSI request field and the set of the subframe sets is configured by thehigher layer, the value of the CSI request field may be defined as shownin FIG. 27. In this case, in a case that the CSI request field isassociated with the example of FIG. 26 as one example, the value of theCSI request field means that the first set of the subframe set includesonly the subframe set #0, the second set of the subframe set includesonly the subframe set #1, or the third set of the subframe set includesboth of the subframe sets #0 and #1.

Next, an example of configuration by the higher layer in a case that themultiple CSI processes are configured will be described. That is, theaforementioned example of configuration by the higher layer may be anexample of configuration by the higher layer in a case that a single CSIprocess is configured. FIG. 28 shows an example of a pair capable ofconfiguration, and it will be described that the number of CSI processesis 2 and the number of subframe sets corresponding to the one CSIprocess is 2. As illustrated in this drawing, in a case that a conditionwhere the report of CSIs of the plurality of subframe sets can betriggered is considered, there are six pairs in total, and, for example,three pairs are configured among these pairs by the higher layer. In theexample of this drawing, in a case that the value of the CSI requestfield is ‘01’, the CSI report of the subframe set #0 of the CSI processID #1 is triggered. In a case that the value of the CSI request field is‘10’, the CSI report of the CSIs corresponding to the subframe sets #0and #1 of the CSI process ID #1 is triggered. In a case that the valueof the CSI request field is ‘11’, the CSI report of CSIs correspondingto the subframe sets #0 and #1 of the CSI process ID #2 is triggered.The aforementioned description is merely an example, and a plurality ofpairs may be configured.

FIG. 29 illustrates definition of the CSI request field of the controlinformation (for example, DCI) transmitted on the PDCCH/EPDCCH in a casethat multiple CSI processes are configured in the embodiment of thepresent invention. In the example of this drawing, the CSI report is nottriggered in a case that the value of the CSI request field is ‘00’, andthe CSI report of the first set of the subframe set of the first CSIprocess is triggered in a case that the value of the CSI request fieldis ‘01’. Further, the CSI report of the second set of the subframe setof the second CSI process is triggered in a case that the value of theCSI request field is ‘10’, and the CSI report of the third set of thesubframe set of the third CSI process is triggered in a case that thevalue of the CSI request field is ‘11’. Of course, one or more CSIprocesses may be respectively included in each of the first, second andthird value of CSI request field, and the plurality of subframe sets maybe respectively included in each of the first, second and thirdsubframes.

Next, another example of configuration by the higher layer in a casethat multiple CSI processes are configured will be described. FIG. 30shows an example of a pair capable of configuration, and it will bedescribed that the number of CSI processes is 2 and the number ofsubframe sets for each CSI process is 2. In this drawing, sincearbitrary CSI report is triggered for the CSI process ID and thesubframe sets, three pairs for which the CSI reports is triggered areconfigured among the 15 pairs in total. In this drawing, for example, ina case that the value of the CSI request field is ‘01’, the CSI reportof CSIs of both subframe sets of CSI process ID #1 and both subframesets of CSI process ID #2 is triggered. In a case that the value of theCSI request field is ‘10’, the CSI report of CSIs subframe set #2 of CSIprocess ID #1 and subframe set #2 of CSI process ID #2 is triggered. Ina case that the value of the CSI request field is ‘11’, the CSI reportof the subframe set #0-1 and the subframe set #1-1 is triggered.

The subframe set #0-1 and the subframe set #0-2 may be the same, or maybe different. The subframe set #1-1 and the subframe set #1-2 may be thesame, or may be different.

FIG. 31 shows an example of configuration of the value of the CSIrequest field in a case that the plurality of cells (for example,carrier application) are configured. In this drawing, in a case that thevalue of the CSI request field is ‘01’, the CSI report for the primarycell is triggered or the CSI report for the secondary cell is triggered.Here, in a case that the CSI report is triggered by a certain value (forexample, ‘01’) of the CSI request field, a CSI report for any one of theprimary cell and the secondary cell is determined depending on whetheror not any serving cell in which a PUSCH is scheduled by the uplinkgrant including the CSI request field of the certain value is theprimary cell or the secondary cell. For example, in a case that aserving cell in which a PUSCH is scheduled by the uplink grant includingthe CSI request field of the certain value is the secondary cell, ‘01’indicates that the CSI report of CSIs of the subframe sets #0-2 and #1-2of the CSI process ID #1 for the secondary cell is triggered. Forexample, in a case that the serving cell in which the PUSCH is scheduledby the uplink grant including the CSI request field of the certain valueis the primary cell, ‘01’ indicates that the CSI report of CSIs of thesubframe sets #0-2 and #1-2 of the CSI process ID #1 for the primarycell is triggered. The triggers of the CSI report are set to ‘10’ and‘11’ as shown in FIG. 31 in the same manner as that in theaforementioned description. For example, in a case that the value of theCSI request field is ‘10’, the CSI report of the CSIs of the subframeset #1-1 of the CSI process ID #1 for the primary cell and the subframeset #1-2 of the CSI process ID #1 for the secondary cell is triggered.It is possible to apply a cell in which the PUSCH is scheduled by theuplink grant including the CSI request field of the certain cell to acase where two or more secondary cells are set, as the serving cell.

FIG. 32 illustrates the relationship between the value of the CSIrequest field of FIG. 31 and the trigger of the CSI report. As describedin FIG. 31, the value of the CSI request field configured by the higherlayer (for example, RRC) is defined in the physical layer as shown inFIG. 32. The serving cell c of FIG. 32 is the serving cell in which thePUSCH is scheduled by the uplink grant including the CSI request fieldset such that the CSI report is triggered.

Although it has been described in the present invention that the CSIrequest field is two bits, the number of bits is not limited thereto.The pair depending on the number of bits may be defined. In a case thatthe CSI request field is one bit, ‘00’ and ‘01’ of two bits of CSIrequest field may correspond to ‘0’ and ‘1’ of one bit of CSI requestfield. One bit of CSI request field is preferably included in the uplinkgrant transmitted in the CSS. One or more bits of CSI request field maybe included in the uplink grant transmitted in the USS. That is, in theaforementioned example of configuration, the terminal device 1 may beapplied to only a case where the uplink grant transmitted in the USS isdetected.

A case where there are the following conditions is included in thepresent invention. For example, in a case that a sum of the number (Nu)of CSIs which are triggered for a given serving cell but are notreported and the number (Ny) of CSIs which are newly triggered for theserving cell exceeds the number of CSIs (Nx) that can be simultaneouslymeasured for the serving cell by the terminal device 1, the terminaldevice 1 may not update CSIs corresponding to CSI reference resourcesfor subframe sets and all CSI processes that are newly triggered exceptfor CSIs corresponding to subframe sets of low indexes and CSI processesof a max number (Nx-Nu, 0) of low indexes of CSIs that are newlytriggered.

That is, in this case, the terminal device 1 determines whether toupdate CSIs corresponding to CSI reference resources for any subframeset and any CSI process on the basis of the index of the CSI process andthe index of the subframe set.

In this case, a CSI corresponding to a subframe set of a low index of aCSI process of a given index has a higher priority than a CSIcorresponding to a subframe set of a low index of a CSI process of thesame index.

For example, in FIG. 30, in a case that the number (Nx) of the CSIs thatcan be simultaneously measured for a given serving cell by the terminaldevice 1 is 3, two CSIs corresponding to the subframe set #0-1 and thesubframe set #1-1 for the serving cell are triggered but are notreported, and two CSI reports corresponding to the CSI reports of thesubframe set #0-2 and the subframe set #1-2 for the serving cell arenewly triggered, the terminal device 1 updates the CSI corresponding tothe CSI reference resource for the subframe set #0-2, and does notupdate the CSI corresponding to the CSI reference resource for thesubframe set #1-2.

The terminal device 1 may transmit information indicating the number(Nx) of CSIs that can be simultaneously measured in one serving cell tothe base station device 3. The number (Nx) of CSIs that can besimultaneously measured in one serving cell may be defined in advance.

FIG. 33 shows an example where one subframe set is configured for oneCSI process. Only one subframe set may be configured for one CSIprocess.

As described above, the terminal device 1 and the base station device 3of the present invention have the following features.

(1) The terminal device 1 of this embodiment is the terminal device 3communicating with the base station device 3. The terminal deviceincludes: a reception unit that receives a downlink control informationformat that is used for scheduling of a physical uplink shared channeland includes request information used to indicate whether to request thetransmission of the channel state information using the physical uplinkshared channel to the terminal device, a higher layer signal includingfirst information used to set at least two subframe sets for one CSIprocess, and the higher layer signal including second information usedto set a correspondence between the two subframe sets for the one CSIprocess and a value to which a field of the request information is set;and a transmission unit that reports the channel state informationcorresponding to one subframe set or each of the plurality of subframesets corresponding to the value of the request information by using thephysical uplink shared channel in a case that the transmission of thechannel state information is requested using the request information.

(2) In this embodiment, the channel state information corresponding tothe subframe set includes a channel quality indicator derived based oninterference measured using a resource corresponding to the subframeset.

(3) The terminal device 1 of this embodiment is the terminal device 1communicating with the base station device 3. The terminal deviceincludes: a reception unit that receives a downlink control informationformat that is used for scheduling of a physical uplink shared channeland includes request information used to indicate whether to request thetransmission of the channel state information to the terminal deviceusing the physical uplink shared channel, a higher layer signalincluding first information used to set one CSI process and the subframeset corresponding to the one CSI process, and the higher layer signalincluding second information used to set a correspondence between thesubframe set corresponding to the one CSI process and a value to which afield of the request information is set; and a transmission unit thatreports the channel state information corresponding to each of thesubframe sets corresponding to the value of the request information byusing the physical uplink shared channel in a case that the transmissionof the channel state information is requested using the requestinformation.

(4) In this embodiment, the base station device 3 includes atransmission unit that transmits a downlink control information formatthat is used for scheduling of a physical uplink shared channel andincludes request information used to indicate whether to request thetransmission of the channel state information using the physical uplinkshared channel to the terminal device, a higher layer signal includingfirst information used to set at least two subframe sets for one CSIprocess, and the higher layer signal including second information usedto set a correspondence between the two subframe sets for the one CSIprocess and a value to which a field of the request information is set.

(5) The base station device 3 of this embodiment includes a receptionunit that receives the channel state information corresponding to onesubframe set or each of the plurality of subframe sets corresponding tothe value of the request information by using the physical uplink sharedchannel in a case that the transmission of the channel state informationis requested using the request information (the value is not “00”).

(6) The base station device 3 of this embodiment includes thetransmission unit that transmits a downlink control information formatthat is used for scheduling of a physical uplink shared channel andincludes request information used to indicate whether to request thetransmission of the channel state information to the terminal deviceusing the physical uplink shared channel, a higher layer signalincluding first information used to set one CSI process and the subframeset corresponding to the one CSI process, and the higher layer signalincluding second information used to set a correspondence between thesubframe set corresponding to the one CSI process and a value to which afield of the request information is set.

(7) The base station device 3 of this embodiment includes a receptionunit that receives the channel state information corresponding to eachof the subframe sets corresponding to the value of the requestinformation by using the physical uplink shared channel in a case thatthe transmission of the channel state information is requested using therequest information.

(8) The wireless communication method of this embodiment is the wirelesscommunication method used in the terminal device 1 communicating withthe base station device 3. The wireless communication method includes:causing receiving means to receive a downlink control information formatthat is used for scheduling of a physical uplink shared channel andincludes request information used to indicate whether to request thetransmission of the channel state information using the physical uplinkshared channel to the terminal device, a higher layer signal includingfirst information used to set at least two subframe sets for one CSIprocess, and the higher layer signal including second information usedto set a correspondence between the two subframe sets for the one CSIprocess and a value to which a field of the request information is set;and causing transmitting means to report the channel state informationcorresponding to one subframe set or each of the plurality of subframesets corresponding to the value of the request information by using thephysical uplink shared channel in a case that the transmission of thechannel state information is requested using the request information.

(9) In the wireless communication method of this embodiment, the channelstate information corresponding to the subframe set includes a channelquality indicator derived based on interference measured using theresource corresponding to the subframe set.

(10) The wireless communication method of this embodiment is thewireless communication method used in the terminal device 1communicating with the base station device 3. The wireless communicationmethod includes: causing the receiving means to receive a downlinkcontrol information format that is used for scheduling of a physicaluplink shared channel and includes request information used to indicatewhether to request the transmission of the channel state information tothe terminal device using the physical uplink shared channel, a higherlayer signal including first information used to set one CSI process andthe subframe set corresponding to the one CSI process, and the higherlayer signal including second information used to set a correspondencebetween the subframe set corresponding to the one CSI process and avalue to which a field of the request information is set; and causingtransmitting means to report the channel state information correspondingto each of the subframe sets corresponding to the value of the requestinformation by using the physical uplink shared channel in a case thatthe transmission of the channel state information is requested using therequest information.

(11) The integrated circuit of this embodiment is the integrated circuitmounted in the terminal device communicating with the base stationdevice. The integrated circuit causes the terminal device to exhibit aseries of functions of receiving a downlink control information formatthat is used for scheduling of a physical uplink shared channel andincludes request information used to indicate whether to request thetransmission of the channel state information using the physical uplinkshared channel to the terminal device, a higher layer signal includingfirst information used to set at least two subframe sets for one CSIprocess, and the higher layer signal including second information usedto set a correspondence between the two subframe sets for the one CSIprocess and a value to which a field of the request information is set,and reporting the channel state information corresponding to onesubframe set or each of the plurality of subframe sets corresponding tothe value of the request information by using the physical uplink sharedchannel in a case that the transmission of the channel state informationis requested using the request information.

(12) In the integrated circuit of this embodiment, the channel stateinformation corresponding to the subframe set includes a channel qualityindicator derived based on interference measured using the resourcecorresponding to the subframe set.

(13) The integrated circuit of this embodiment is the integrated circuitmounted in the terminal device 1 communicating with the base stationdevice 3. The integrated circuit causes the terminal device to exhibit aseries of functions of receiving a downlink control information formatthat is used for scheduling of a physical uplink shared channel andincludes request information used to indicate whether to request thetransmission of the channel state information to the terminal deviceusing the physical uplink shared channel, a higher layer signalincluding first information used to set one CSI process and the subframeset corresponding to the one CSI process, and the higher layer signalincluding second information used to set a correspondence between thesubframe set corresponding to the one CSI process and a value to which afield of the request information is set; and reporting the channel stateinformation corresponding to each of the subframe sets corresponding tothe value of the request information by using the physical uplink sharedchannel in a case that the transmission of the channel state informationis requested using the request information.

The program which runs on the base station device 3 and the terminaldevice 1 according to the invention may be a program (which causes acomputer to function) which controls a central processing unit (CPU)such that the functions of the above-described embodiment of theinvention are implemented. The information handled by these devices istemporarily stored in a random access memory (RAM) during the processand is then stored in various types of read only memories (ROMs), suchas a flash ROM, or a hard disk drive (HDD). Then, the CPU reads,corrects, and writes the information, if necessary.

Some functions of the terminal device 1 and the base station device 3according to the above-described embodiment may be implemented by acomputer. In this case, a program for implementing the control functionmay be recorded on a computer-readable recording medium and a computersystem may read the program recorded on the recording medium and executethe program to implement the functions.

The term “computer system” means a computer system that is provided withthe terminal device 1 or the base station device 3 and includes an OS orhardware such as peripheral devices. The term “computer-readablerecording medium” means a portable medium, such as a flexible disk, amagneto-optical disk, a ROM, or a CD-ROM, or a storing device, such as ahard disc provided in the computer system.

The “computer-readable recording medium” may include a recording mediumthat dynamically stores the program in a short time, such as acommunication cable used in a case that the program is transmittedthrough a network, such as the Internet, or a communication line, suchas a telephone line, and a recording medium that stores the program fora predetermined period of time, such as a volatile memory in a computersystem that serves as a server or a client in this case. The “program”may be a program that implements some of the above-mentioned functionsor a program that implements the above-mentioned functions incombination with the program which has been stored in the computersystem.

The base station device 3 according to the above-described embodimentmay be realized as an aggregate (device group) of a plurality ofdevices. Each of the devices forming the device group may have some orall of the functions or the functional blocks of the base station device3 according to the above-described embodiment. The device group may haveeach function or each functional block of the base station device 3. Theterminal device 1 according to the above-described embodiment cancommunicate with the base station device which is an aggregate ofdevices.

The base station device 3 according to the above-described embodimentmay be an evolved universal terrestrial radio access network (EUTRAN).In addition, the base station device 3 according to the above-describedembodiment may have some or all of the functions of a higher node ofeNodeB.

Each of the terminal device 1 and the base station device 3 according tothe above-described embodiments may be partly or entirely realized inthe form of an LSI, which is a typical integrated circuit, or a chipset. Each functional block of the terminal device 1 and the base stationdevice 3 may be individually integrated into a chip, or some or all ofthe functional blocks may be integrated into a chip. A method forachieving the integrated circuit is not limited to the LSI and it may beachieved by a dedicated circuit or a general-purpose processor. Inaddition, in a case that a technique for achieving an integrated circuitwhich replaces the LSI technique will be developed with the progress ofa semiconductor technique, the integrated circuit manufactured by thedeveloped technique can also be used.

In the above-described embodiment, the terminal device is given as anexample of a terminal device or a communication device. However, theinvention is not limited thereto. The invention can also be applied toterminal devices or communication devices of stationary or non-movableelectronic apparatuses which are installed indoors or outdoors, such asAV apparatuses, kitchen devices, cleaning and washing machines, airconditioners, office devices, vending machines, and other homeappliances.

The embodiment of the invention has been described above in detail withreference to the drawings. However, the detailed structure is notlimited to the above-described embodiment and the invention alsoincludes a change in the design within the scope and spirit of theinvention. Various modifications and changes of the invention can bemade without departing from the scope of the claims and the technicalrange of the invention includes embodiments obtained by appropriatelycombining technical means described in different embodiments. Inaddition, the elements which are described in each of theabove-described embodiments and have the same effect may be replacedwith each other.

Reference Signs List

1 (1A, 1B, 1C) Terminal device

3 Base station device

101 Higher layer processing unit

103 Control unit

105 Reception unit

107 Transmission unit

301 Higher layer processing unit

303 Control unit

305 Reception unit

307 Transmission unit

1011 Radio resource control unit

1013 Subframe setting unit

1015 Scheduling information interpretation unit

1017 CSI reporting control unit

3011 Radio resource control unit

3013 Subframe setting unit

3015 Scheduling unit

3017 CSI reporting control unit

1: A terminal device that communicates with a base station device, theterminal device comprising: receiving circuitry configured to receivehigher layer information used to indicate two subframe sets; andtransmitting circuitry configured to transmit first channel stateinformation for one of the two subframe sets, and to transmit secondchannel state information for another one of the two subframe sets. 2: Abase station device that communicates with a terminal device, the basestation device comprising: transmitting circuitry configured to transmithigher layer information used to indicate two subframes sets; andreceiving circuitry configured to receive first channel stateinformation for one of the two subframe sets, and to receive secondchannel state information for another one of the two subframe sets. 3: Acommunication method of a terminal device that communicates with a basestation device, the communication method comprising: receiving higherlayer information used to indicate two subframe sets; transmitting firstchannel state information for one of the two subframe sets; andtransmitting second channel state information for another one of the twosubframe sets. 4: A communication method of a base station device thatcommunicates with a terminal device, the communication methodcomprising: transmitting higher layer information used to indicate twosubframes sets; receiving first channel state information for one of thetwo subframe sets; and receiving second channel state information foranother one of the two subframe sets.